a dark brown humic substance that is soluble in water only at pH values greater than 2;
"the half-life of humic acid is measured in centuries"
双语例句
This paper describes the principles and methods of extracting humic acid product from lignite. 摘要论述了褐煤中提取腐殖酸产品的方法及原理。
Humic acid had significant photosensitization on tetramethrin,and itsphotosensitization increased rapidly as the humic acid concentration increased. 腐殖酸对胺菊酯光敏化作用显著，并随腐殖酸浓度的增加而迅速增强。
This article presents the production of the foliage fertilizers of humic acid from weathered coals and its application. 介绍以贵州风化煤为原料，生产腐植酸多元复合肥的生产方法及应用前景。
An indirect method was used for determing the complex calcium in nitro humic acid complex calcium. 用间接法测定了硝基腐植酸钙中络合钙的含量。
