隐蔽剂在螯合滴定中的应用(Ⅺ)——苦杏仁酸可作为锡(Ⅳ)的新隐蔽剂  

THE USE OF MASKING AGENTS IN CHELOMETRY(Ⅺ)——MANDELIC ACID AS A NEW MASKING AGENT FOR TIN(Ⅳ)

作　　者：陈永兆[1] 陈焕光[1] 黎宪纲 杜达安 Chen Yongzhao;Chen Huanguang;Li Xiangang;Du Daan(Department of Chemistry,Zhongshan University,Guangzhou)

机构地区：[1]中山大学化学系

出　　处：《高等学校化学学报》1983年第6期709-714,共6页Chemical Journal of Chinese Universities

摘　　要：本文提出苦杏仁酸为锡(Ⅳ)的新隐蔽剂,在pH2至5.5均能隐蔽锡,其隐蔽能力以在pH3.0至3.5最强,1克的苦杏仁酸足以隐蔽35毫克的锡。建立了EDTA-苦杏仁酸隐蔽法间接滴定锡,锆、钍、铋、铁(Ⅲ)、镓、铈、镧、汞铅、镍、钴、锌、镉、钙、镁、少量锰和铝(用丙二酸隐蔽)、钛(加入过氧化氢)、锑(Ⅲ)(用酒石酸隐蔽)等不干扰。本法选择性很高,溶样后即可准确测定锡合金或锡矿中的锡。Mandelic aci.d was found to be a good masking agent for tin(Ⅳ)at pH 2 to 5.5.The masking power is highest at pH 3.0 to 3.5 and 1 g of mandelic acid can mask up to 35 mg of tin.With the“EDTA-mandelic acid masking method”,tin can be determined in present of Zr,Th,Bi,Fe,Ga,Ce(Ⅲ),La,Hg,Pb,Cu,Ni,Co,Zn,Cd and a little amount of Mn.The interference of Al,Ti(Ⅳ)and Sb(Ⅲ)can be eliminated respectively with malonic acid,hydrogen peroxide and tartaric acid as masking agents.In this way,the tin in alloys and minerals can be determined rapidly and accurately.

关 键 词：苦杏仁酸 隐蔽剂 螯合滴定 锡合金 铁(Ⅲ) 丙二酸 过氧化氢 锑(Ⅲ) 

分 类 号：R28[医药卫生—中药学]