Then the reason is analyzed that why the colourreagent will be easily turbid and the intercept will be often too big when the ammonia standard curve is being protracted.
并分析了在绘制氨氮标准曲线时显色液易浑浊和截距常常偏大的原因；
2
When the tipping point comes, and all of the unknown reagent has reacted, the solution changes colour.
当滴定终点到来时，所有的未知溶液全都完成了化学反应，溶液的颜色就会发生变化。
3
Using thymol-sodium hypobromite as chromogenic reagent, and extracting the colour formed with butanol, a spectrophotometric method for the determination of arginine in fermentation broth was studied.