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Screening method for metals based on array spectrophotometry and multivariate analysis

✍ Scribed by Eva Engström; Bo Karlberg

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
604 KB
Volume
10
Category
Article
ISSN
0886-9383

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✦ Synopsis

A rapid screening method for detection of heavy metals in aqueous samples has been developed. The method simply involves mixing the sample with a buffer containing the chelating agent PAR in volume proportion 1:l and then measunng the absorbance of the mixture in the range 190-820 nm. Partid least squares modelling has been applied for prepared mixtures of the metal ions Cd2+, Cu2+, Pb2+ and Zn", and identification and quantification of individual metals could be made in the total concentration range 1-20 pM. Typical root mean square errors of prediction were of the order of 0.5 pM. Classification of real samples was rnade by using principal cornponent analysis. The h i t of detection for the total metai concentration was estimated as 1.5 pM for the synthetic samples and about 4 pM for the real samples. Identification of samples containing large amounts of iron and copper respectively was possible. "he levels of explained Y-variance reached 82% for iron, 76% for copper and 78% for the total metal concentration.

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