摘要
为快速高效测定红层砂岩亚铁元素含量以确定岩层的风化程度,本文建立了标准化测定红层砂岩亚铁元素含量的邻菲啰啉分光光度计法,对该方法过程中所用的相关试剂(HF、H_(2)SO_(4)、邻菲啰啉、NH_(4)HCO_(3)、硼酸、乙酸-乙酸铵等)用量、浓度及流程进行了标准化。以砂岩消解效果、加标回收率、亚铁吸光度值稳定性为关键指标,对所用试剂的用量和浓度、试剂加入顺序、水浴时长进行单因素实验,根据实验结果确定各试剂用量取值范围及浓度,并对标准化方法进行适用性研究。结果表明,不同试验条件下邻菲啰啉分光光度计法测定红层砂岩亚铁含量有明显差异;标准化方法的浓度检出限约为0.08 mg/L,Fe(Ⅱ)分析方法加标回收率为89.04%~100.8%,全铁分析方法的加标回收率为85.97%~113.6%,表明标准化方法稳定可靠。
In order to rapidly and efficiently measure the ferrous iron content in red layered sandstone for conveniently determining the degree of rock weathering,this study established a standardized phenanthroline spectrophotometric technique with the standardization of usages,concentrations,and procedures of relevant reagents(HF,H_(2)SO_(4),o-phenanthroline,NH_(4)HCO_(3),boric acid,acetic acid-ammonium acetate,etc.)involved in the analytical process.Using sandstone digestion effectiveness,spike recovery rates,and stability of ferrous iron absorbance as key indicators,single-factor experiments have been conducted on the reagent quantities and concentrations,reagent addition sequences,and water bath durations.Based on the experimental results,the optimal quantities and concentrations of reagents have been determined,and the applicability of the standardized method has been evaluated.The results show that there are significant differences in ferrous iron contents of red layered sandstones measured by using the phenanthroline spectrophotometric technique under various experimental conditions.The standardized method has detection limit of approximately 0.08 mg/L,with spike recovery rates ranging from 89.04%to 100.8%for the Fe(II)analytical method and from 85.97%to 113.6%for the total iron analytical method,indicating the stability and reliability of the standardized method.
作者
孙海洋
杨根兰
蒋文杰
朱健
黄崇平
SUN Hai-yang;YANG Gen-lan;JIANG Wen-jie;ZHU Jian;HUANG Chong-ping(Key Laboratory of Karst Georesources and Environment(Guizhou University),Ministry of Education,Guizhou University,Guizhou 550025,China;College of Resources and Environmental Engineering,Guizhou University,Guizhou 550025,China)
出处
《矿物岩石地球化学通报》
CSCD
北大核心
2024年第6期1229-1238,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
贵州省科技计划项目(黔科合基础-ZK[2021]一般200)。
关键词
红层砂岩
亚铁
邻菲啰啉
分光光度法
标准化
red layered sandstone
ferrous
phenanthroline
spectrophotometry
standardization
作者简介
第一作者:孙海洋(1999—),男,硕士研究生,研究方向:地质工程.E-mail:2920133389@qq.com;通信作者:杨根兰(1977—),女,副教授,博士,硕士生导师,研究方向:岩体稳定及环境地质工程.E-mail:yanggenlan@163.com.
