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- W2369366970 abstract "Analysis of environmental water samples is primarily conducted in the laboratory,which costs considerable time and money.Pre-concentration methods coupled with portable X-ray Fluorescence(XRF) have been developed for the determination of almost twenty kinds of heavy metals,but with a relatively high detection limit,complex operation,and less element types can be measured using one pre-concentration strategy.All of these problems restrict the development of the technique.To solve these issues an on-site-oriented rapid and convenient analysis method of heavy metal ions in aqueous solutions has been developed utilizing a bench-top type portable Energy-Dispersive X-ray Fluorescence(EDXRF).Based on pre-concentration with purolite S930 chelating resin and thin-layer sample preparation technique,the method could determine trace V5 +,Mn2 +,Fe3 +,Co2 +,Ni2 +,Cu2 +,Zn2 +and Pb2 +in environmental water samples.After the heavy metal ions have been absorbed by 20 mg of S-930 resin powder for about 30 min in the p H = 4 solution,the resin powders are filtrated onto a 0.45 m filter to form a thin-layer sample which can be directly measured by EDXRF using a homemade double polypropylene film sample cup.With an amount of 100 m L of solution,the linear ranges were 10- 1000 μg / L and the correlation coefficients of the calibration curves were good(R2 0.997) for all the eight elements.The lower limit of detection was between 1.0 and 6.2μg /L.Precision tests carried out on multi-element mixed solutions showed that the relative standard deviations(RSD,n =12) were better than 5% except for those of Zn and Pb at the concentration level of 20 μg/L.Most of the recoveries were 80%- 120% with spikes of 20 μg / L for each element.The analysis results of DW standard substances and simulation samples were consistent with reference values and the theoretical value respectively.This method skillfully uses a double polypropylene membrane preparation method to make a thin-layer film sample which solves the pollution problem and simplifies the pre-concentration steps.The resin film samples can be directly measured by XRF.A lower detection limit and better stability make the method suitable for a spot investigation,water quality monitoring,and assessment of Fe,Co,Ni,Cu,V,Zn,Mn and Pb in heavy metal polluted environmental water." @default.
- W2369366970 created "2016-06-24" @default.
- W2369366970 creator A5051114682 @default.
- W2369366970 date "2015-01-01" @default.
- W2369366970 modified "2023-09-27" @default.
- W2369366970 title "Portable EDXRF Analysis of Eight Heavy Metals in Environmental Water Using Pre-concentration with Purolite S930 and Thin-layer Sample Technique" @default.
- W2369366970 hasPublicationYear "2015" @default.
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