水质PH值测定操作规程
<div><h2 style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:23.05pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">（</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">一</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">）</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">分析</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">试剂</span></h2><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">1、重蒸馏水：经煮沸冷却，电导率小于2μS/cm。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">2、PH值标准溶液：</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（1）PH值标准溶液配制</span></p><div style="text-align:center"><table cellspacing="0" cellpadding="0" style="border-collapse:collapse; margin:0 auto; width:100%"><tr style="height:28.35pt"><td style="background-color:#c0c0c0; border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.62%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">名称</span></p></td><td style="background-color:#c0c0c0; border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:33.3%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">成份及浓度</span></p></td><td style="background-color:#c0c0c0; border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:11.36%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">25℃</span><span style="font-family:微软雅黑; font-size:12pt">时</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">的PH</span></p></td><td style="background-color:#c0c0c0; border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.72%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">每1000mL25℃</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">水溶液所需药品质量</span></p></td></tr><tr style="height:28.35pt"><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.62%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">邻苯二甲酸</span><span style="font-family:微软雅黑; font-size:12pt">标准溶液</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:33.3%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0</span><span style="font-family:微软雅黑; font-size:12pt">.05mol/L苯</span><span style="font-family:微软雅黑; font-size:12pt">二甲酸</span><span style="font-family:微软雅黑; font-size:12pt">氢钾</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:11.36%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">4.008</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.72%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">10.21KC</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">8</span><span style="font-family:微软雅黑; font-size:12pt">H</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">5</span><span style="font-family:微软雅黑; font-size:12pt">O</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">4</span></p></td></tr><tr style="height:28.35pt"><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.62%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">中性磷酸盐</span><span style="font-family:微软雅黑; font-size:12pt">标准溶液</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:33.3%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0</span><span style="font-family:微软雅黑; font-size:12pt">.025mol/L磷酸二氢钾</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0.025</span><span style="font-family:微软雅黑; font-size:12pt">m</span><span style="font-family:微软雅黑; font-size:12pt">ol/L磷酸氢二钠</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:11.36%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">6.865</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.72%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3.388GKH</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">2</span><span style="font-family:微软雅黑; font-size:12pt">PO</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">4</span><span style="font-family:微软雅黑; font-size:12pt">+</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3.533gNa</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">2</span><span style="font-family:微软雅黑; font-size:12pt">HPO</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">4</span></p></td></tr><tr style="height:28.35pt"><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.62%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">硼酸盐</span><span style="font-family:微软雅黑; font-size:12pt">标准溶液</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:33.3%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0</span><span style="font-family:微软雅黑; font-size:12pt">.01mol/L水硼酸钠</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:11.36%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">9.180</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.72%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3.8gN</span><span style="font-family:微软雅黑; font-size:12pt">aB</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">4</span><span style="font-family:微软雅黑; font-size:12pt">O</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">7</span><span style="font-family:微软雅黑; font-size:12pt">·10H</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">2</span><span style="font-family:微软雅黑; font-size:12pt">O</span></p></td></tr><tr style="height:28.35pt"><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.62%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">碳酸盐</span><span style="font-family:微软雅黑; font-size:12pt">标准溶液</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:33.3%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0</span><span style="font-family:微软雅黑; font-size:12pt">.025mol/L碳酸氢钠</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">0.025mol/L碳酸钠</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:11.36%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">10.012</span></p></td><td style="border-bottom-color:#000000; border-bottom-style:solid; border-bottom-width:0.75pt; border-left-color:#000000; border-left-style:solid; border-left-width:0.75pt; border-right-color:#000000; border-right-style:solid; border-right-width:0.75pt; border-top-color:#000000; border-top-style:solid; border-top-width:0.75pt; padding-left:5.03pt; padding-right:5.03pt; vertical-align:middle; width:27.72%"><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">2.092gNaHCO</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">3</span><span style="font-family:微软雅黑; font-size:12pt">+</span></p><p style="margin:0pt; orphans:0; text-align:center; widows:0"><span style="font-family:微软雅黑; font-size:12pt">2.64gNa</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">2</span><span style="font-family:微软雅黑; font-size:12pt">CO</span><span style="font-family:微软雅黑; font-size:8pt; vertical-align:sub">3</span></p></td></tr></table></div><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（2）磷酸二氢钾和磷酸氢二钠用前应在100～</span><span style="font-family:微软雅黑; font-size:12pt">105℃</span><span style="font-family:微软雅黑; font-size:12pt">下烘干两小时。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（3</span><span style="font-family:微软雅黑; font-size:12pt">）若</span><span style="font-family:微软雅黑; font-size:12pt">采用市售的经计量单位检定合格的袋装PH值标准物质，可按说明书配制。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（4）配好的溶液贮存于聚乙烯瓶中，有效</span><span style="font-family:微软雅黑; font-size:12pt">期</span><span style="font-family:微软雅黑; font-size:12pt">为</span><span style="font-family:微软雅黑; font-size:12pt">一个月。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3、</span><span style="font-family:微软雅黑; font-size:12pt">仪器有为设备：</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（1）酸度计：0～14PH单位，最小分度值≤0.1PH单位。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（2）饱和甘汞电极。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（3）PH玻璃电极。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（4）磁力搅拌器：搅拌</span><span style="font-family:微软雅黑; font-size:12pt">棒用玻璃或塑料密封。</span></p><h2 style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:23.05pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">（</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">二</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">）</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">分析步骤</span></h2><p style="margin:0pt; orphans:0; text-align:justify; text-indent:27pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">1、按仪器使用说明书仔细调试仪器，并预热半小时。</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:27pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">2、定位</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（1）单点定位：</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">仪器插入电极，选择开关置于PH档，仪器斜率调节器调节在100%位置，</span><span style="font-family:微软雅黑; font-size:12pt">定位前电极用水冲洗三次，并用滤纸把电极上附着的水吸</span><span style="font-family:微软雅黑; font-size:12pt">干</span><span style="font-family:微软雅黑; font-size:12pt">。</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">选择一种与被测水样PH值接近的PH值标准溶液</span><span style="font-family:微软雅黑; font-size:12pt">（如PH=6.864），并把电极放入这一缓冲溶液中，调节温度调节</span><span style="font-family:微软雅黑; font-size:12pt">器与</span><span style="font-family:微软雅黑; font-size:12pt">溶液</span><span style="font-family:微软雅黑; font-size:12pt">温度相同，并摇动试杯，使溶液均匀</span><span style="font-family:微软雅黑; font-size:12pt">。</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">读数稳定后，该读数应为缓冲溶液的PH值，否则调节定位调节器。</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">清洗电极，并吹干电极球泡表面的余水。</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">（2）双点定位：</span></p><p style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">选择</span><span style="font-family:微软雅黑; font-size:12pt">两个PH标准溶液，用其中低PH标准溶液，按单点定位法进行定位，然后用水将电极冲洗三次，用滤纸将水吸干，再将电极移入高PH标准溶液中，按下读数开关，指针应指示在该标准溶液的标准PH值。若偏差大于0.1PH单位，反复用上述两个标准溶液进行定位，直到两个标准溶液均显示标准值或偏差不大于0.1PH单位为止。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3、水样的测定：</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">定位后，用水样将电极冲洗三</span><span style="font-family:微软雅黑; font-size:12pt">次，</span><span style="font-family:微软雅黑; font-size:12pt">移入</span><span style="font-family:微软雅黑; font-size:12pt">盛有约40mL水样的塑料烧杯中，用电磁搅拌器搅拌30秒后，按下读数开关，读取PH值。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">水样温度应与标准溶液温度基本一致。</span></p><h2 style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:23.05pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">（</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">三</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">）注释：</span></h2><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">1、水的颜色、浊度</span><span style="font-family:微软雅黑; font-size:12pt">、胶体物质、氧化剂、还原剂及较高的含盐量均不干扰测定。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">2、因温度影响电极电位和水的电离平衡，故调节仪器的温度补偿应与溶液的温度一致，并使被测样品与校正仪器用的标准溶液温度误差在</span><span style="font-family:微软雅黑; font-size:12pt">1℃</span><span style="font-family:微软雅黑; font-size:12pt">之内。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">3、新使用的玻璃电极应在蒸馏水中浸泡24小时进行活化。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">4、玻璃电极暂不用时，应浸泡在水中。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">5、玻璃电极和甘汞电极内不得有气泡，以防断路</span><span style="font-family:微软雅黑; font-size:12pt">。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">6、甘汞电极中的</span><span style="font-family:微软雅黑; font-size:12pt">饱和氯</span><span style="font-family:微软雅黑; font-size:12pt">化钾溶</span><span style="font-family:微软雅黑; font-size:12pt">液的液面必须高出汞体，在室温下应有少许氯化钾晶体存在，以保证氯化钾溶液饱和。</span></p><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">7、玻璃电极受污染时，可用稀盐酸或丙酮清洗，禁用乙醇、洗涤剂清洗，清洗后的</span><span style="font-family:微软雅黑; font-size:12pt">电极用水浸泡24小时。</span></p><h2 style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:23.05pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">（</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">四</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">）允许差：</span></h2><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">平行测定两个结果之差不大于0.1PH单位。</span></p><h2 style="font-size:12pt; line-height:150%; margin:0pt; orphans:0; text-align:justify; text-indent:23.05pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">（</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">五</span><span style="font-family:微软雅黑; font-size:12pt; font-weight:bold">）结果表示：</span></h2><p style="margin:0pt; orphans:0; text-align:justify; text-indent:20.15pt; widows:0"><span style="font-family:微软雅黑; font-size:12pt">取平行测定两结果算术平均值，作为水样中的PH值。</span></p></div> GBT 6904-2008 工业循环冷却水及锅炉用水中pH的测定http://www.lqywater.com/forum.php?mod=viewthread&tid=78&fromuid=1
(出处: 山东蓝其源环保科技有限公司)
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