Fertilizers determination of ammoniacal nitrogen content formaldehyde method .

肥料中氨态氮含量的测定。

Ammoniacal nitrogen ; water ; chemical water pollutants ; absorption spectrophotometry .

氨态氮;水;吸收分光光度测定法;化学水污染物。

Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution .

尿素与硝酸铵之混合物，存於水或铵溶液者。

Study on exchange performance of lithium ion-sieve synthesized by reduction - ammoniacal leaching residue of polymetallic nodules .

多金属结核氨浸渣合成的锂离子筛吸附性能研究。