Urea – Spectrophotometric Method
1. Principle The sample (feed or feed ingredient) is suspended in distilled water with a clarifying agent. The urea content is determined using a spectrophotometer after addition of 4-dimethylaminobenzaldehyde (4-DMAB). 2. Scope The method is suitable for feeds and forages. Some feeds have added urea as a supplemental source of nitrogen. This method describes determination…