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A novel chromogenic reaction involving copper(Ⅱ)and bromosulphonazoⅢ(Br-SAZⅢ)in hexamethylenetetramine- hydrochloric buffer solution was investigated.The results showed that a blue complex of copper(Ⅱ)and bromosulphonazoⅢwas formed with a molar ratio of 1:1.The apparent molar absorptivity was 3.3×10~5L mol~(-1)cm~(-1)and the maximum absorption peak was at 616.8 nm.The proposed procedure was used for quantitative estimation of Cu(Ⅱ)in the concentration range of 0-1.024μg/mL with the detection limit(3σ)of 7.03×10~(-4)μg/mL(n=20).The relative standard deviations(RSDs)were 0.56-4.68%.Under the optimized conditions,total copper in the vegetables and tea was successfully determined.
A novel chromogenic reaction involving copper (II) and bromosulphonazo III (Br-SAZIII) in hexamethylenetetramine-hydrochloric buffer solution was investigated. The results showed that a blue complex of copper (II) and bromosulphonazo III was formed with a molar ratio of 1: 1.The The apparent molar absorptivity was 3.3 × 10 ~ 5L mol -1 cm -1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu (Ⅱ) in the concentration range of 0 -1.024 μg / mL with the detection limit (3σ) of 7.03 × 10 -4 μg / mL (n = 20) .The relative standard deviations (RSDs) were 0.56-4.68% .Under the optimized conditions, total copper in the vegetables and tea was successfully determined.