| 重铬酸钾法测特定化学需氧量几种屏蔽氯离子干扰方法比较 |
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| 引用本文： | 陈超,钱玉亭.重铬酸钾法测特定化学需氧量几种屏蔽氯离子干扰方法比较[J].云南环境科学,2014(1):99-100. |
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| 作者姓名： | 陈超 钱玉亭 |
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| 作者单位： | 江阴市环境监测站,江苏江阴214431 |
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| 摘 要： | 探讨了COD为60mg/L的情况下,氯离子对测定值的影响。氯离子浓度在100mg/L时,固态硫酸汞可完全屏蔽其干扰;氯离子浓度在500 mg/L时,液态硫酸汞可完全屏蔽其干扰;绘制COD-氯离子标准曲线,屏蔽氯离子浓度可达2000mg/L,但操作较为繁琐;在水样环境单纯的情况下,用低浓度重铬酸钾法,可忽略氯离子的干扰。
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| 关 键 词： | 重铬酸钾法 化学需氧量 氯离子 干扰 屏蔽 |
Comparison of Several Methods for the Removal of Chloride Ion When Measuring COD with Potassium Dichromate Method |
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| CHEN Chao,QIAN Yu-ting.Comparison of Several Methods for the Removal of Chloride Ion When Measuring COD with Potassium Dichromate Method[J].Yunnan Environmental Science,2014(1):99-100. |
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| Authors: | CHEN Chao QIAN Yu-ting |
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| Institution: | (Jiangyin Environmental Monitoring Station,Jiangyin,Jiangsu 214431,China) |
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| Abstract: | This paper,presented the influence of chloride ion on COD when it was 60mg/L.When chloride ion concentration was about 100mg/L,solid mercury sulfate could be used to screen the interference of chloride ion.It is the same case when chloride ion concentration was about 500mg/L.By drawing the standard curve with COD as the y-coordinate and chloride ion concentration as the x-coordinate,we could see that the maximum chloride ion concentration was about 2000mg/L without interference.But the operation was complicated.The influence of chlo-ride ion might be negligible in water with low COD measuring by 0.025 mol/L potassium dichromate. |
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| Keywords: | potassium dichromate method chemical oxygen demand chloride ion interference shield |
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