期刊
TALANTA
卷 72, 期 2, 页码 839-841出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2006.11.012
关键词
molybdenum blue; nylon membranes; arsenic; phosphate; groundwater; syringe filters
Filtering synthetic arsenic- or phosphate-containing solutions (1.5-47.6 mu mol/L) with nylon syringe filters significantly reduced absorbances (by 6-74%) when analyzed with the colorimetric molybdenum blue method. Filtering the same solutions with cellulose acetate syringe filters yielded no significant differences as compared to unfiltered controls. The detrimental effect of nylon membranes was also observed when pure Milli-Q water was filtered and Subsequently spiked with arsenic(III) or phosphate suggesting that some compound(s) eluting from the filter membranes interfere with the color formation in the assay. Consequently, we caution against using nylon filters when filtering water samples for the determination of arsenic or phosphate with the molybdenum blue method. (c) 2006 Elsevier B.V. All rights reserved.
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