【摘 要】
：
A simple, rapid, accurate and selective complexometric method is proposed for the determina-tion of mercury(Ⅱ). Mercury(Ⅱ) is first complexed with a known ex
【机 构】
：
Department of Studies in Chemistry Mangalore University Mangalagangothri 574 199 Karnataka State In
【出 处】
：
Chinese Journal of Chemistry
论文部分内容阅读
A simple, rapid, accurate and selective complexometric method is proposed for the determina-tion of mercury(Ⅱ). Mercury(Ⅱ) is first complexed with a known excess of EDTA and the surplusEDTA is back-titrated at pH 5. 0--6. 0 with lead nitrate, xylenol orange being used as indicator. Hexa-hydropyrimidine-2-thione (HPT) is then added to displace EDTA from the Hg-EDTA complex quan-titatively and the EDTA released is titrated with lead nitrate. Reproducible and accurate results areobtained for 2--55 mg of mercury, with a relative error of less than 0. 5% and standard deviation ofless than 0.04.
A simple, rapid, accurate and selective complexometric method is proposed for the determina- tion of mercury (II). Mercury (II) is first complexed with a known excess of EDTA and the surplusEDTA is back- titrated at pH 5.0 - Hexa-hydropyrimidine-2-thione (HPT) is then added to displace EDTA from the Hg-EDTA complex quan-titatively and the EDTA released is titrated with lead nitrate. 6. 0 with lead nitrate, xylenol orange being used as indicator. and accurate results areobtained for 2--55 mg of mercury, with a relative error of less than 0.5% and standard deviation of less than 0.04.
其他文献
秋风吹出满地金黄,天上燃烧着俏夕阳。俏夕阳红红火火,俏夕阳明明亮亮。晚秋因你而精彩,岁月因你而甜香。你是一首美丽的诗,你是一曲醉人的乐章。秋风吹黄了绿纱帐,晚霞舞红
Some new pyridazinone derivatives(3) were synthesized through addition of antipyrin to β-aroylacrylic acids (1) followed by cyclization of the adducts. Reacti
利用PCR方法扩增生防细菌成团肠杆菌(Enterobacteragglomerans,IC1270)基因组调节基因GrrS、GrrA、rpoD、rpoS,插入质粒pGEMT-easy中。切下目的片段与酶切穿梭质粒pJFF224-XN
作为现代船舶制造业的关键技术,近年来该行业发展取得的优异成果与现代船舶焊接技术存在较为紧密联系,相关研究的大量涌现也能够证明这一认知,基于此,本文简单分析了现代船舶
阜阳市局 ￡4a 局长——_MINtkMMtgj’＃lnH＄B——q.M——D收束志不他只邀狲位J则【科校为先导推动地租工作.B为广为戳民U用凶盼引眯B.习.互们羹宽.互狈槽竺汹IAn.刊 办好杂志。必
Ｍｏｓｓｂａｕｅｒｓｔｕｄｙｏｆｍａｒｔｅｎｓｉｔｉｃｔｒａｎｓｆｏｒｍａｔｉｏｎａｎｄｃｏｌｌｅｃｔｉｖｅ ｍａｇｎｅｔｉｃ ｅｘｃｉｔａｔｉｏｎｓｉｎＦｅ_９Ｎｉ．１ｆｉｎｅ ｐａｒｔｉｃｌｅｓＨ．Ｍ．Ｗｉｄａｔａｌｌａｈ，ＨｕａｎｇＲｕｎ－Ｓｈ?..
Mossbauerstudyofmartensitic transformation andcollective magnetic excitationsinFe_9Ni. 1fine particlesH. M. Widatallah, Huang
歌咏活动是校园活动的一项重要内容,而指挥者是歌咏活动的核心领导者。指挥动作的正确与否直接关系到歌唱的效果,所以笔者总结了校园歌咏活动中指挥容易出现的几点错误,并且
安承熙,男,汉族,1941年生,1966年毕业于兰州大学化学系。现任青海省测试计算中心副主任,青海省化学学会理事,副研究员,享受政府特殊津贴的国家级专家。
An Chengxi, male, H
1农村卫生事业科学发展、前景光明近年来,党和政府对卫生工作的重视程度不断加大。卫生惠民工程连续三年列入常州市政府重点工程。今年常州市委1号文件《关于做好2010年农业
Reactions of lanthanoid trichlorides with sodium cyclopentylcyclopentadienyl in THFafford bis(cyclopentylcyclopentadienyl) lanthanoid chloride complexes (C_5H_