权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Determination of Trace Elements by Solid-phase Spectrophotometry after Collection on a membrane filter

膜过滤器收集后用固相分光光度法测定微量元素

基本信息

批准号：
03640484
负责人：
OHZEKI Kunio
金额：
$ 1.28万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

1.Determination of uranium(VI)in seawaterUranium(VI) was collected on a membrane filter as a complex with 3-[4-(5-bromo-2- pyridylazo)-3-hydroxy-N-propylanilino]propanesufonate(5-Br-PAPS), together with the ion-pair precipitate formed between Zephiramine and perchlorate ions, and determined by solid-state spectrophotometry. The selectivity of the method could be improved with the use of trans-cyclohexane-1,2-diaminetetraacetic acid and an ethylenediamine buffer solution of pH 7. Except for carbonate ion, other trace elements and the major constituents of seawater did not affect the determination of uranium. The interference from the carbonate ion was eliminated by the removal of the ion as carbon dioxide from the acidified seawater sample with ultrasonic agitation. The concentration of uranium in a seawater sample was found to be 3.26 mugLAMBDA with a relative standard deviation of 2.2% (n=21) for 30-50 ml of seawater.2.Determination of cobalt(II) in white wineCobalt(II) was made to react with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol(5-Br- PADAP) at pH 5 in the presence of hydrogen peroxide and a ligand buffer solution composed of ethylenediaminetetraacetic acid and an excess of zinc(II). The reaction mixture was then acidified to pH 1.8 by the addition of perchloric acid and the cobalt(III)-5- Br-PADAP was collected on a membrane filter. The complex on the filter was determined by solid-phase spectrophotometry. Inorganic trace elements and major constituents of white wine did not affect the determination of cobalt(II). The effect of alcohol could be eliminated by 1:1 dilution of wine samples with water. The concentration of cobalt in 10 different wine samples was in the range 2.4-5.6 mugLAMBDA.

1.采用膜滤法将铀（VI）与3-[4-（5-溴-2-吡啶偶氮）-3-羟基- n-丙基苯胺]丙磺酸盐（5-Br-PAPS）配合，并与泽非拉明与高氯酸盐离子形成离子对沉淀，采用固相分光光度法测定。采用反式环己烷-1,2-二胺四乙酸和pH为7的乙二胺缓冲液可提高该方法的选择性。除碳酸盐离子外，其他微量元素和海水主要成分对铀的测定没有影响。通过超声波搅拌去除酸化海水样品中以二氧化碳形式存在的碳酸盐离子，消除了碳酸盐离子的干扰。在30-50 ml海水中，铀的浓度为3.26 mugLAMBDA，相对标准偏差为2.2% （n=21）。在过氧化氢和乙二胺四乙酸和过量锌（II）组成的配体缓冲溶液的存在下，在pH为5的条件下，将钴（II）与2-（5-溴-2-吡啶偶氮）-5-二乙基氨基苯酚（5-br - PADAP）反应。然后通过添加高氯酸将反应混合物酸化至pH 1.8，并在膜过滤器上收集钴(III)-5- Br-PADAP。采用固相分光光度法测定滤光片上的配合物。白葡萄酒中无机微量元素和主要成分对钴（II）的测定没有影响。酒样用水1:1稀释可消除酒精的影响。10种不同的葡萄酒样品中钴的浓度在2.4-5.6 mugLAMBDA之间。