论文部分内容阅读
应用锌试剂(2-羧基2’-羟基- 5’-磺苯甲(月替)作显色剂,以双波长分光光度法测定铝合金中的微量锌.在pH9.28的条件下,选择试剂和配合物的最大吸收峰波长(490nm、620nm)分别为参比波长和测定波长,读取吸光度差对锌浓度作图,0～2μg/ml范围内呈良好线性关系.由直线斜率计算摩尔吸光系数为4.4×10~4,是单波长光度法的2倍.样品分析结果与标准值一致,相对标准偏差<5%.
Zinc reagent (2-carboxy-2’-hydroxy-5’-sulfobenzyl) was used as a reagent to determine the trace zinc in aluminum alloy by dual-wavelength spectrophotometry.Under the condition of pH9.28, Reagents and complexes of the maximum absorption peak wavelength (490nm, 620nm), respectively, the reference wavelength and the measured wavelength, read the absorbance difference plotted against zinc concentration, 0 ~ 2μg / ml showed a good linear relationship within the slope calculated by the slope of the molar Absorbance coefficient of 4.4 × 10 ~ 4, is double the wavelength of single-wavelength sample analysis results consistent with the standard value, the relative standard deviation of <5%.