英语语法分析

A reversed - phase HPLC method was established to determine the biuret content in urea.

建立一种测定尿素中缩二脲含量的反相高效液相色谱(HPLC)方法。

The analysis method for biuret content in long-efficacy urea using hydroquinone as an additive is studied and tested.

本文介绍了以对苯二酚为添加剂的缓效尿素中缩二脲含量分析方法的试验研究情况。

Its ninhydrin reaction was negative, but after acid hydrolysis, its ninhydrin reaction and biuret reaction were positive.

茚三酮反应呈阴性，用酸水解后茚三酮反应和双缩脲反应呈阳性。