Abstract
In this article, the thymol, one of phenolic derivative as color creative reagent and nitropruside as reaction catalyst were investigated for photometric and visual quick-test determination of ammonia in fresh and drinking water based on Berthelot (phenate) method. For this purpose, one test set should have maximum 2 to 3 mixed components solution. So the different solution preparation modes and reagents combination were studied. The investigation results showed that the 2 mixed solution mode was impossibly prepared because nitropruside was decomposed in strong oxidative solution such as hypochlorite and increased color intensity when mixed with thymol in strong alkaline solution by ageing. The 3 mixed solution mode was proposed and optimal components mixing was fount i. e. solution 1 is nitropruside in ammonia free water; solution 2 is hypochlorite in carbonate buffer at pH 10 and solution 3 is thymol and EDTA in 2M of sodium hydroxide. This 3 solution test set was used for ammonia quick determination. Following proposed test procedure, the full color creation takes less than 5 minutes and total time for one test is approximately 7 – 8 minutes. The ammonia concentration in different samples determined by photometric and visual method using 3 solution test set were compared with conventional spectrophotometric method. The measured values showed that analytical results were agreed each with other and the proposed test set could be used as test-kit for field measurement or common monitoring ammonia in fresh and drinking water. The maximum relative error is less than 25%.
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