摘要
对钒（V）与1-（2一吡啶偶氮）-2-萘酚-过氧化氢-十六烷基三甲基溴化铵显色反应进行了试验，结果表明：在1mol·L^-1盐酸介质中，在十六烷基三甲基溴化铵存在下，钒（V）与1-（2-吡啶偶氮）-2-萘酚和过氧化氢反应生成红色多元络合物，络合物的最大吸收波长为577nm，表观摩尔吸光率为3．04×10^4L·mol^-1·cm^-1，钒（V）的质量浓度在1．0mg·L^-1以内符合比耳定律。络合物的组成比为n钒（V）：nPAN：n过氧化氢=1：1：1。方法用于土壤试样中痕量钒的测定，测定值的相对标准偏差（72—6）均小于9％，回收率在97．8％～101．5％之间，测得标准样品（GSS-5）中钒的含量为170．45μg·g^-1，与标准值（166±9）μg·g^-1之间的相对误差为2．7％。
It was found that in an acidic medium of 1 mol·L^-1 HC1 and in the presence of CTMAB, a ternary complex, with mole ratio of 1 to 1 to 1, was formed by the reaction of V（V） with 1-（2-pyridylazo）-2- naphthol （PAN） and hydrogen peroxide, having its absorption maximum at the wavelength of 577 nm and the value of apparent molar absorptivity of 3.04×10^4L·mol^-1·cm^-1. Beer＇s law was kept in the concentration range within 1.0 mg · L^-1 of vanadium（V）. The proposed method was used for determination of vanadium in 4 samples of soil, including a standard sample （GSS-5）. Values of RSD＇s （n=6） found were less than 9%, and results of recovery found by standard addition method were in the range of 97. 8%--101.5%. Relative error between results found for the standard sample （170. 45 μg·g^-1） and the certified value （166±9） μg·g^-1 was 2. 7%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2009年第6期721-723,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
广西自然科学基金资助项目(桂科自0728218桂科自0679005)
桂林理工大学科研项目启动费资助
