摘要
由于水溶性有机态硒及有机质的存在,准确测定土壤水溶性硒宜经浓缩、消化处理后进行.采用在适量硝酸存在的条件下,以Fe3+作为固定剂,沸水浴浓缩土壤水提取液,再经硫酸-硝酸混合消化,用氢化物原子荧光光度计测定硒.结果认为:在适量Fe3+和硝酸存在条件下,土壤水提取液经浓缩、消化处理后,硒测定值较未作处理的提高40%以上,加标回收率在98%~102%之间,变异系数≤0.3%;浓缩和消化过程中,根据水提液有机质的含量,适量地使用硝酸和硫酸对保证测定的精密度具有重要意义.
As soil water extract contains much water-soluble organic selenium and organic matter, the determination of soil water-soluble selenium should be concentrated and digested beforehand. Water extracts from the soil was concentrated in boiling bath under the presence of nitric acid and with added Fe^3＋ as fixative, and then digested with mixed acid before selenium content was determined by a hydride atomic fluorescence spectrometer. The resuhs showed that the determina tion values were raised by 40% or more than those of the untreated soil, the recoveries were between 98 ～102%, and the variation coefficient was ≤ 0. 3%. In the process of enrichment and digestion, suitable use of nitric acid and sulfuric acid to ensure the accuracy according to the dissolved organic matter content is of great significance.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第7期145-149,共5页
Journal of Southwest University(Natural Science Edition)
基金
国家科技计划资助项目
沿三峡水库农业面源污染防控与综合治理技术研究(2007BAD87B10)
关键词
土壤
水溶性硒
Fe^3+固定
浓缩消化
测定
soil
water-soluble selenium
Fe^3＋fixation
concentration and digestion
determination
作者简介
童建川（1984-）．男，重庆九龙坡人，西南大学硕士研究生，主要从事土壤化学研究．
通讯作者：杨剑虹．
