西居延海(黑风口地区)不同粒径颗粒物中磷的化学形态分析

Chemical Speciation of Phosphorus in Sand Particles with Different Size from Heifengkou

采用改进的化学连续提取法对黑风口地区颗粒物中磷的各种化学形态进行测定,并对颗粒物进行分级形态研究.结果表明:黑风口颗粒物中的总磷含量(TP)为828.48～1 915.38μg/g,不同位置的沙在组成、结构、磷结合性和容量方面有很大不同,其主要成分是钙磷(Ca-P),有机磷(Org-P)次之;在不同粒度的颗粒物中,Ca-P的含量最高,占TP的81.42%～93.65%,其次是有机磷,占TP的2.92%～9.29%,其他形态磷含量的高低顺序为铝结合态磷(Al-P)>可交换磷(Ex-P)>铁结合态磷(Fe-P)>闭蓄态磷(Obs-P);在所取沙漠颗粒物中,TP、Ca-P、Org-P、Ex-P的含量都随颗粒物目数的增大而增大,而Obs-P、Fe-P的含量随颗粒物目数的增大而减小.

Various phosphorus species in sand grains with different sizes from Heifengkou are studied with improved sequential extraction method. The results show that the concentration of total phosphorus （TP）in Heifengkou sand is from 828.49μg/g to 1 915.38μg/g,with main composition of Ca-P. In the sand samples with different particle sizes, Ca-P is the most abundant specie with 81. 42%- 93. 66% in TP; Org-P,the second abundant specie is 2.92%~9.29% in TP. The other speciation,in turn,are AI-P,Ex-P, Fe-P and Obs-P. The contents of TP,Ca-P, Org-P,Ex-P increase with decreasing in sand particle size, hut Obs-P and Fe-P are contrary.