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<p><span>水样的干扰及消除：①氯离子是主要的干扰成分②在测试时，Mn（Ⅲ）、Mn（Ⅵ）或Mn（Ⅶ）形成红色物质③在酸性重铬酸钾条件下④试样中的有机氮通常转化成铵离子⑤为了得到结果</span></p><p><span><br/></span></p><p><span><br/></span></p><p><span>水样的干扰及消除：</span></p><p><span><br/></span></p><p><span>　?、俾壤胱邮侵饕母扇懦煞?，水样中含有氯离子会使测定结果偏高，一般的复合C1试剂至少可以掩蔽1000mg/L以下的氯离子干扰，大于1000mg/L的氯离子含量，可稀释后再测定；</span></p><p><span><br/></span></p><p><span>　?、谠诓馐允?，Mn（Ⅲ）、Mn（Ⅵ）或Mn（Ⅶ）形成红色物质，会引起正偏差，其500mg/L的锰溶液（硫酸盐形式）引起正偏差COD值为1083mg/L，其50mg/L的锰溶液（硫酸盐形式）引起正偏差COD值为121mg/L；</span></p><p><span><br/></span></p><p><span>　?、墼谒嵝灾馗跛峒靥跫?，一些芳香烃类有机物、吡啶等化合物难以氧化，其氧化率较低。</span></p><p><span><br/></span></p><p><span>　?、苁匝械挠谢ǔＷ娠Ю胱?，铵离子不被重铬酸钾氧化。</span></p><p><span><br/></span></p><p><span>　?、菸说玫浇峁?，对于氯离子浓度很高（接近浓度）而COD浓度较小的样品，使用低量程测定。</span></p><p><span><br/></span></p><p><span>　　水样氯离子的测定方法：</span></p><p><span><br/></span></p><p><span>　　在试管中加入2.00mL试样，再加入0.5mLxiao酸银</span>溶液，充分混合，加入2滴铬酸钾溶液，摇匀，如果溶液变红，氯离子溶液低于1000mg/L；如果仍为黄色，氯离子浓度高于1000mg/L。</p><p><span><br/></span></p><p><span>　　也可按【GB/T11896】方法测定水样中氯离子的浓度。对于含氯高的水样可通过加入硫酸汞掩蔽剂而避免干扰，一般情况下，当COD值为50mg/L以上，氯离子浓度超过1000mg/L以上时，可采用稀释法，用蒸馏水稀释水样使氯离子含量低于1000mg/L，再进行分析。</span></p><p><br/></p><p 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