摘要
建立了微波消解-磷钼蓝分光光度法检测土壤和水系沉积物中总磷的方法.对微波消解的条件进行了优化,确定了以HNO3-H2O2（体积比为3∶1）为消解剂,最终消解温度为150℃,保持时间为15 min的最佳消解条件.探讨了显色酸度、干扰离子、测定波长等因素对显色体系的影响,结果表明,在0.8 mol/L的酸度下,吸收峰在825 nm处符合比尔定律.应用方法对土壤和水系沉积物标准物质进行分析验证,测定值与认定值相符,相对标准偏差（RSD,n=6）均在0.9％～3.1％范围内.在实际样品测定中,方法与高温熔融消解-磷钼蓝分光光度法进行对照,测定结果无显著性差异.
A method for the determination of total phosphorus in soil and stream sediments by micro- wave digestion-phosphorus molybdenum blue spectrophotometry was established. The microwave di- gestion conditions were optimized as follows： the sample was digested at 150 ℃ for 15 min with HNO3-H2O2 （3 ： 1） as digestion agent. The effect of such factors as chromogenic acidity, interfering ions and measuring wavelength on the chromogenic system was investigated. The results showed that Beer＇s law was complied in the acidity of 0.8 mol/L with absorption wavelength of 825 nm. The meth od was applied to soil and stream sediment reference material for analysis verification, the results were consistent with the certified values, and the relative standard deviation （RSD, n=6） was in the range of 0. 9%-3. 1%. In the determination of actual samples, the proposed method was compared with high-temperature fusion digestion-phosphorus molybdenum blue spectrophotometry and the results showed no significant discrepancy.
出处
《冶金分析》
CAS
CSCD
北大核心
2013年第12期52-56,共5页
Metallurgical Analysis
关键词
微波消解
磷钼蓝光度法
土壤和水系沉积物
总磷
microwave digestion
phosphorus molybdenum blue spectrophotometry
soil and stream sediment
total phosphorus
