摘要
2mol.l-1KCl溶液可作为无土栽培中基质的NH4+—N和NO3-—N的提取剂,其固∶液=1∶5,振荡时间为30min,NH4+—N测定采用靛酚蓝比色法,测定波长为645nm,标准曲线的回归方程为:A=0.7358C+0.0044,r=0.9994(n=7),回收率为:103.6%。NO3-—N测定采用紫外分光光度法,测定波长为205nm,标准曲线的回归方程为:A=0.5654C+0.0127,r=0.9994(n=9),回收率为:102.4%。
KC1 aqueous solution （2mol.l^-1 ） was used to extract the armnoniacal nitrogent and nitric nitrogen from media of soilless culture. The weight ratio of media to extractant was 1：5. After 30 minutes vibration, ammoniacal nitrogen was determined at 645nm by indophenol blue colorimetry, the regression equation： A= 0.7358C ＋ 0.0044, r=0.9994（ n = 7）, the rate of recovery： 103.6%. nitric nitrogen was did at 205nm by UV- spectrophometry, the regression equation： A = 0.5654C ＋ 0.0127,r=0.9994（n=9）, the rate of recovery： 102.4%.
出处
《上饶师范学院学报》
2006年第3期53-57,共5页
Journal of Shangrao Normal University
