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A spectrophotometric method for the determination of Cr(VI) precipitation in small volume faucet samples which were less than 50 mL was established. The method was verified by precision and standard addition recovery, and the uncertainty of the measurement results was evaluated. After analysis, the precipitation of Cr(VI) in the extracting solution of the faucet samples was measured as (50.7±1.7) μg/L, (k=2, P=95%). Small volume detection method which just needs 5 mL samples solution had the advantages of small sample consumption, simple and quick operation, and can meet the requirements of the product, especially the faucet samples with small internal volume.

Determination of Cr(VI) precipitation in small faucet samples by spectrophotometry and evaluation of the uncertainty