微波高压消解后二苯碳酰二肼分光光度法测定城镇污泥中总铬的验证
Verification of the Determination of Total Chromium in Urban Sludge by Diphenylcarbazide Spectrophotometric Method after Microwave High-pressure Digestion
冯志强1
作者信息
- 1. 太原市城市排水管理中心,山西 太原 030012
- 折叠
摘要
对《城镇污泥标准检验方法》(CJ/T 221-2023)中《铬及其化合物微波高压消解后二苯碳酰二肼分光光度法》进行验证,在实验室对空白进行加标后,测定7次,测得本方法检出限为0.016mg/L,当取样量为1.000 g,定容体积为50 mL时计算的污泥检出限为0.65 mg/kg.对水系沉积物中重金属总量标物进行加标测定,测定得到加标回收率为87.0％和118％,该方法测得标准曲线的线性关系良好,精密度相对标准偏差满足方法要求,重复性良好,加标回收率在80.0％～120％.本方法结果能满足城镇污泥总铬的测定要求,各项指标均能达到规定的要求.
Abstract
This paper validates the Diphenylcarbazide Spectrophotometric Method for Chromium and its Compounds after Microwave High-pressure Digestion in The Standard Test Method for Urban Sludge(CJ/T 221-2023).After adding standards to the blank in the laboratory and measuring 7 times,the detection limit of this method was determined to be 0.016 mg/L.When the sampling amount is 1.000 g and the constant volume is 50 mL,the calculated sludge detection limit is 0.65 mg/kg.The total amount of heavy metals in water sediment was determined by spiked determination,and the spiked recovery rates were 87.0％and 118％,respectively.The linear relationship of the standard curve was good,and the relative standard deviation of precision met the requirements of the method.The repeatability was good,and the spiked recovery rate was between 80.0％and 120％.The results of this method can meet the requirements for determining total chromium in urban sludge,and all indicators can meet the specified requirements.
关键词
方法验证/城镇污泥/分光光度法/总铬Key words
method validation/urban sludge/spectrophotometric method/total chromium引用本文复制引用
出版年
2024
NETL
NSTL
万方数据