Extraction-photometric selective determination of trace perchlorates in potable waters
Tóm tắt
A method is proposed for the selective photometry determination of perchlorates in potable water with a detection limit of 2×10−3 mg/L is proposed based on the extraction of its ion pair with the astrafloxin cation and absorbance measurements at 540 nm. The following ratios of matrix ions are acceptable (in parentheses): ClO−, ClO
2
−
, ClO
3
−
, BrO
3
−
(500); I− (1000); IO
3
−
(7000); HCO
3
−
, Cl−,SO
4
2−
, NO
3
−
, Br−, Na+, K+, Ca2+, Mg2+ (10000). The relative error of determination for ClO
4
−
is 20% in the range 4 × 10-3-1 × 10−2 mg/L and 10% in the range 1 × 10-2–5 × 10−2 mg/L.
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