摘要
采用水浸取法和硅胶色层法 ,通过紫外吸收光谱峰定性鉴定了英格兰七种土壤水溶性腐殖酸 .沉积土中水溶性腐殖酸均展示了二组峰值 ,而在草原土中低分子量组份消失 .选用γ谱仪测定了沉积土水溶性腐殖酸中的放射性核素1 37Cs,采用中子活化测量技术分析了常量钠和氯 .结果表明 ,在高盐含量的沉积土中存在的大量竞争络合离子钠可能是使放射性核素1
Water soluble soil humic acids were analyzed from seven different soils in England by gel filtration chromatography(GFC)followed by indentifing in 290nm using UV-Vis absorption spectrophotometer.For the estuary soil there exhibited two groups of peaks from soluble humic acid,howe- ver,the lower mass group were disappear for the grass land soil.The activity of 137Cs in sediment samples from estuaries was determined initially using high resolution γ-ray spectrometry in order to ensure that no isotopic interference would occur when using a low resolution NaI(Tl)detector for the analyses of GFC fractions.Sodium and chlorine were determined by neutron activation.The results show that radiocaesium is unlikely exist in an organically complexed state within the estuarine environment,because it seems likely that the more abundant sodium ion has displaced 137Cs from binding sites on the humic acid itself.
出处
《环境化学》
CAS
CSCD
北大核心
2003年第5期511-515,共5页
Environmental Chemistry
