| The test condition was discussed on determination of total cyanide in water by isonicotinic acid/barbituric acid spectrophotometry. Influence factor of distillate liquid volumes during distillation time on the test was analyzed. Preparation of colour-display reagent and store time were identified. It made some suggestion such as reducing distillate quantity collected during distillation at no significant differences of test results, storing solution of chloramine T and isonicotinic acid-barbituric acid in a refrigerator to keep temperature at 4 ℃, usually which solution could be stable in 4 weeks. |
