分光光度法测定水样中镁  

Spectrophotometric Determination of Magnesium in Water Samples

作　　者：张晓霞[1] 马玉芹[1] 胡欢杰[1] 

机构地区：[1]长春理工大学化学与环境工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2013年第1期81-83,共3页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：在pH 9.0的NH3-NH4Cl介质中,Mg（II）-对乙酰基偶氮氯膦络合物的最大吸收峰为620 nm,该波长处吸光度与Mg（II）浓度在0~1.6μg/mL范围内呈良好的线性关系,其回归方程为A=0.3525 C（μg/mL）＋0.0053,检出限为22ng/mL。本法用于测定水样中的镁。加标回收率为93.8%~100%,11次测定的相对标准偏差为1.27%~4.51%。In the medium of pH 9.0 NH3-NH4Cl, the maximum absorption peak of Mg （Ⅱ） - （p-acetylchlorophosphonazo） locates at 620 nm. At the wavelength ,the absorbance （A） is linearly related with the concentration of Mg （Ⅱ） over the range of 0-1.6 μg/mL and its regression equation is： A=0.3525 C （μg /mL） ＋ 0.0053 .The detection limit of method is 22 ng/mL. The method was used to determine magnesium in water samples with the recovery of standard addition of method 93.8%-100%.The relative standard deviation was 1.27%-4.51% for eleven replicate determinations.

关 键 词：镁 分光光度法 对乙酰基偶氮氯膦 

分 类 号：O657.32[理学—分析化学]