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白杨素在紫外区内具有强吸收,Cu2+加入后会导致其吸光度显著下降,且吸光度的降低与Cu2+的浓度呈良好的线性关系,基于此建立了紫外光谱法测定Cu2+的新方法。通过对缓冲溶液体积、p H、白杨素浓度等进行考察和优化,在p H 8.28、9.0×10-2mol/L的六亚甲基四胺(HM TA)-HCl缓冲溶液中,4.0×10-8~1.0×10-6mol/L范围内,Cu2+浓度与吸光度降低成正比,线性方程为ΔA=0.508 c-0.0147(10-6mol/L)(R=0.99604),检出限为7.08 nmol/L(S/N=7),对4.0×10-8mol/L Cu2+溶液平行测定7次,ΔA的相对标准偏差为4.0%。对印制线路板废水中的铜进行了测定,测得结果与EDTA滴定法基本一致。
Chlitin has a strong absorption in the ultraviolet region. The addition of Cu2 + will lead to a significant decrease of absorbance, and the decrease of absorbance has a good linear relationship with the concentration of Cu2 +. Based on this, a new method for the determination of Cu2 + by UV spectrophotometry was established. The buffer solution volume, p H, chrysin concentration and so on were investigated and optimized, in the 8.2 μ pH 8.28, 9.0 × 10-2mol / L hexamethylenetetramine (HMTA) -HCl buffer solution, 4.0 × 10 The linear equation was ΔA = 0.508 c-0.0147 (10-6 mol / L) (R = 0.99604) with the detection limit of 7.08 nmol / L in the range of -8 ~ 1.0 × 10-6mol / L (S / N = 7). The relative standard deviation of ΔA was 4.0% when the concentration of 4.0 × 10-8 mol / L Cu2 + solution was determined in parallel. The printed circuit board wastewater copper determination, measured results and EDTA titration method is basically the same.