摘要
酚二磺酸光度法测定水中硝酸盐氮的方法改进孙佩君程秀英李娜（开封市环境保护科学研究所，开封，４７５００３）通过对样品预处理、校准曲线绘制、样品测定进行的探讨，发现并分析了酚二磺酸光度法测定ＮＯ－３存在的误差，提出了改进的方法，在实际工作和国标样考核中...
Based on the making of land types with remote sensing TM image in the transitional region of Qinling mountain and Huang-Huai plain,this paper discusses its land types composition,and analyses its dominant factors making land different in each size and land types regular pattern in the space. It further expounds its characteristics of many directions in physical transition,diversity of dominant factors making land different and multiplicity of land types composition in the space.
出处
《河南大学学报（自然科学版）》
CAS
1997年第2期59-60,共2页
Journal of Henan University:Natural Science
关键词
水分析
硝酸盐氮
酚二磺酸光度法
transitional region of Qinling moutain and Huang-Huai plain
TM image analysis
land types composition
