摘要
建立气相分子吸收法快速测定工业废水中硫化物的方法。水样经乙酸锌溶液固定后转化成硫化锌沉淀,硫化锌沉淀与盐酸反应转化成硫化氢,用载气将硫化氢气体载入气相分子吸收光谱仪的吸光管中,于202.6nm波长处测定吸光度,吸光度与硫化物质量浓度之间的关系符合朗伯-比尔定律。硫化物质量浓度在0.02~10.0mg/L范围内与吸光度线性关系良好,相关系数为0.9996,方法检出限为0.005mg/L。采用所建方法分别对水质硫化物标准样品、硫化物标准溶液和加标工业废水平行测定6次,测定值的相对标准偏差为1.3%~7.9%。对水质硫化物标准样品和硫化物标准溶液进行测定,测定值与标准值基本一致,相对误差为-5.0%~2.3%。含硫和不含硫工业废水实际样品的加标回收率分别为85.6%和80.1%。该方法快速、灵敏、准确,可用于工业废水中硫化物的检测。
A method for the rapid determination of sulfides in industrial wastewater by gas phase molecular absorption was established.The water sample was fixed in zinc acetate solution and converted into zinc sulfide precipitate.The zinc sulfide precipitate reacted with hydrochloric acid to convert into hydrogen sulfide.The hydrogen sulfide gas was loaded into the absorption tube of the gas phase molecular absorption spectrometer by using carrier gas,and the absorbance was determined at the wavelength of 202.6 nm.The relationship between absorbance and the mass concentration of sulfide followed Lambert-Beer's law.The mass concentration of sulfides had a good linear relationship with absorbance in the range of 0.02-10.0 mg/L,with the correlation coefficient of 0.9996,and the detection limit was 0.005 mg/L.Six measurements were conducted by using the established method on water quality sulfide standard samples,sulfide standard solutions,and spiked industrial waste levels,the relative standard deviation of the determination results was 1.3%-7.9%.The determination of water quality sulfide standard samples and sulfide standard solutions showed that the determination values were basically consistent with the standard values,with the relative error of-5.0%to 2.3%.The actual recovery rates of sulfur containing and non sulfur containing industrial wastewater samples were 85.6%and 80.1%,respectively.This method is fast,sensitive,and accurate,and it can be used for the detection of sulfides in industrial wastewater.
作者
王昭
赵彬
姚帮本
WANG Zhao;ZHAO Bin;YAO Bangben(Anhui Institute of Product Quality Supervision and Inspection,Hefei 230051,China;Anhui Ecological Environment Monitoring Center,Hefei 230071,China)
出处
《化学分析计量》
CAS
2023年第10期39-43,共5页
Chemical Analysis And Meterage
关键词
硫化物
气相分子吸收光谱法
工业废水
sulfide
gas phase molecular absorption spectrometry
industrial wastewater Chemical Analysis and Meterage,2023,32(10):39.
