测定红层砂岩亚铁含量的邻菲啰啉分光光度法标准化研究
A study on the standardization of phenanthroline spectrophotometry for the determination of ferrous iron content in red layered sandstone
孙海洋 1杨根兰 2蒋文杰 2朱健 2黄崇平3
作者信息
- 1. 贵州大学喀斯特地质资源与环境教育部重点实验室,贵阳 550025
- 2. 贵州大学喀斯特地质资源与环境教育部重点实验室,贵阳 550025;贵州大学资源与环境工程学院,贵阳 550025
- 3. 贵州大学资源与环境工程学院,贵阳 550025
- 折叠
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、H2SO4、邻菲啰啉、NH4HCO3、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.
Abstract
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,H2SO4,o-phenanthroline,NH4HCO3,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.
关键词
红层砂岩/亚铁/邻菲啰啉/分光光度法/标准化Key words
red layered sandstone/ferrous/phenanthroline/spectrophotometry/standardization引用本文复制引用
出版年
2024
NETL
NSTL
万方数据