C above ambient temperature. When sample temperature is too high, the sample cools quickly as it contacts the ampoule's inner surface. This rapid sample cooling causes the small gas bubble in the ampoule to contract, drawing air into the ampoule. The atmospheric oxygen reacts with the oxygen sensitive reagent, causing positive interference. A. Timing is very important in colorimetric testing.
Some reagents continue to develop color after the specified development time.
The most accurate test results are obtained when the reading is taken in the prescribed time frame. For answers to other frequently asked questions, click on FAQ . CHEMetrics, Inc. has proudly been supplying analytical test kits to thewater testing industry for nearly 30 years. However, you may not know that some of the most interesting applications for our kits have nothing at all to do with water. Sulfites in Wine Wine makers commonly add sulfites to wines as antioxidants and antimicrobial agents.