摘要
在碱性条件下过硫酸钠能氧化腐植酸发生化学发光反应。本研究以过硫酸钠-腐植酸化学发光体系为基础,建立了腐植酸的过硫酸钠氧化-流动注射化学发光测定方法,同时对测定方法的负高压及增益、泵速、过硫酸钠浓度、氢氧化钠浓度等影响因素进行了优化实验。方法的线性范围为0.1～500 mg/L(相关系数为0.9985),检出限为0.076 mg/L,对浓度为0.5 mg/L的腐植酸进行11次平行测定,相对标准偏差(RSD)为3.47%。利用该方法对5种不同地区地下水中的腐植酸进行测定,样品的加标回收率在98.33%～107.50%之间。该方法无需分离,简单易行,对实际样品测定结果满意。
Based on systematic studies, sodium persulfate has a photochemical reaction to oxidize humic acid under alkaline conditions. The photochemical dynamic curve of Na2S208-humic acid system has been established. The reaction conditions were optimized for negative high voltage, gain, pump speed, Na2S20s and NaOH concentration. A new photochemical analysis method to determine humic acid in loess has been established with a linear range from 0.1 mg/L to 500 mg/L （R = 0. 9985 ） and a detection limit of 0.076 mg/L. Eleven replicate determinations were conducted on 0.5 mg/L humic acid, and the calculated relative standard deviation （RSD） was 3.47%. According to the determinations of humic acid from 5 different groundwater samples with an internal calibration, the standard recovery rates of the samples were between 98.33% and 107.50%. This method was successful in the determination of humic acid without any separation.
出处
《岩矿测试》
CAS
CSCD
北大核心
2012年第4期677-681,共5页
Rock and Mineral Analysis
基金
国家自然科学基金项目(41072185)
关键词
流动注射
化学发光法
地下水
腐植酸
过硫酸钠
flow-injection
chemiluminescence method
groudwater
humic acid
sodium persulfate
