Uncertainty of ICP-AES Determination of Antimony in Wastewater
Printing and dyeing wastewater contain high concentrations of pollutants such as dyes,organic additives,and heavy metals,among which heavy metal antimony is widely detected in printing and dyeing wastewater such as polyester.The biological toxicity and risk of antimony in sewage cannot be ignored,as it can cause enzymatic denaturation,chromosomal variation,and has bioaccumulation and carcinogenic toxicity in organisms.The uncertainty analysis and evaluation work are an important component of wastewater detection results data analysis and quality control,and it is also one of the important methods to improve the accuracy of measurement results.The objective of this experiment is to determine the mass concentration of antimony in water samples using an inductively coupled plasma emission spectrometer.According to the latest"Determination of 32 Elements in Water Quality by Inductively Coupled Plasma Emission Spectroscopy"(HJ 776-2015),the uncertainty of antimony in wastewater is evaluated.By analyzing the uncertainty components that affect the determination results,such as standard solution,standard working curve fitting,and pre-treatment digestion process,the extended uncertainty of the determination results is calculated,and the main factors affecting this uncertainty are identified.It can be inferred that the main source of uncertainty in the determination of antimony content in wastewater by inductively coupled plasma atomic emission spectrometry(ICP-AES)is the uncertainty introduced by the nonlinearity of the standard curve.The uncertainty report of antimony concentration in the wastewater measured in this experiment is 0.97±0.072 mg/L.
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