吸光度比值-导数光谱法同时测定水中铅和汞  

Simultaneous Determination of Mercury and Lead by Absorbance Ratio-Derivative Method

作　　者：张淑芳[1] 谢怡[1] 

机构地区：[1]曲阜师范大学化学科学学院,山东省曲阜市273165

出　　处：《曲阜师范大学学报（自然科学版）》2007年第4期87-89,共3页Journal of Qufu Normal University(Natural Science)

基　　金：曲阜师范大学基金(XJ03006)

摘　　要：提出了运用吸光度比值-导数光谱同时测定Hg2+和Pb2+的新方法.在0.08 mol/L的磷酸介质及聚乙烯醇存在下,Hg2+和Pb2+均可与I-及罗丹明B形成离子缔合物,其最大吸收波长分别为610 nm和615 nm,摩尔吸光系数分别为6.1×105和2.3×105.汞和铅的浓度分别在0.1-1.6μg/mL和0.6-2.2μg/mL范围内符合Beer定律.其检测限分别为0.08及0.55μg/mL.此方法可应用于环境水样中Hg2+和Pb2+的同时测定,结果满意.In this paper, an absorbance ratio-derivative method for the simultaneous determinaton of mercury and lead has been developed. Hg^2＋ or Pb^2＋ reacts with I^- and Rhodamine B to form ion-association compound in the presence of 0.08 mol/L H3PO4 solution. The maximum absorbances of ion-associative compounds of Hg^2＋ and Pb^2＋ are at 610 nm and 615 nm,the molar absorbances are 6.1 ×10^5 L · mol^-1 · cm^-1 and 2.3× 10^5 L · mol^-1 · cm^-1respectively. Beer＇s law is obeyed in the range of 0. 1-1.6 μg/mL Hg^2＋ and 0.6-2.2 μg/mL Pb^2＋. The detection limits of Hg^2＋and Pb^2＋ are 0.08 μg/mL and 0.55 μg/mL, respectively. This method has been applied to the determination of Hg^2＋ and Pb^2＋ from surroundings water with satisfactory results.

关 键 词：吸光度比值-导数光谱法 同时测定 铅 汞 

分 类 号：O657.32[理学—分析化学]