尿碘检测废液中砷的处理方法研究

Study on the removal of arsenic from the waste solution of iodine determination in urine

目的研究简单高效的处理方法去除尿碘检测废液中的高砷，以达到国家砷排放标准，保护环境。方法采用氢氧化钙-硫酸亚铁混凝二次沉降法处理检测废液，二乙基二硫代氨基甲酸银分光光度法检测含砷量。结果一级处理加氢氧化钙72．0g／L，硫酸亚铁51．6g／L；二级处理加氢氧化钙1．0g／L，硫酸亚铁4.5g/L。经二级处理后检测废液pH值为6．67，含砷量低于0．33mg／L，砷去除率高达99．99％以上，可安全排放。结论本方法可作为《尿中碘的砷铈催化分光光度测定方法》（WS／T107—2006）方法的补充，去除尿碘检测废液中的高砷．达到国家砷排放标准，建议在尿碘测定实验室推广，减少砷污染的危害。

Objective To explore a simple and high efficient way of removing high-density arsenic from experimental waste of iodine determination in urine in order to meet the waste water discharge standards and to protect the environment. Methods The detection waste solution was dealt with by using the method of calcium hydroxide-ferrous sulfate, and the arsenic contents were detected by silver diethyldithiocarbamate spectrophotometric method, Results The first treatment was conducted by adding the calcium hydroxide 72.0 g/L and the ferrous sulfate 51.6 g/L, and the second by adding 1.0 g/L calcium hydroxide and 51.6 g/L ferrous sulfate. The arsenic content was less than 0.33 mg/L and the pH was 6.67 after being treated. The removal rate was more than 99.99%, and the sludge was stable without secondary pollution. Conclusions The approach can be used as the necessary supplement of WS/T 107-2006, removing high-density arsenic from experimental waste of iodine determination in urine in order to meet the waste water discharge standards and to protect the environment, and should be popularized in the determination of iodine in urine.