Sulphite 5Titration / Drop Count Test for Sulphite 1 drop = 5 mg/L SO32- |
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| Product Code | 606200 |
| Contents | Hydrochloric Acid, 15 mL Indicator, 15 mL Titration Solution, 15 mL Test Tube, 10 mL Instructions for Use |
| Analytical Method | Iodometric Titration: In acid conditions, sulphite ions are oxidised by iodine. The titration endpoint is indicated by an excess of iodine causing a colour change from colourless to blue (starch indicator). |
| Number of Tests | 50 – 80 (depending on sulphite levels) |
| Interferences | Strongly alkaline water samples have to be neutralised before testing. Reducing agents other than sulphite (e.g. ascorbic acid) will give positive results. |
| Measuring Range | The recommended measuring range is 10 to 100 mg/L (2 – 20 drops @ 5 mg/L) for 5 mL of sample volume. This range can be extended by taking a smaller or larger water sample. For a 2.5 mL sample the measuring range is 20 to 200 mg/L and for a 10 mL sample the range is 5 to 50 mg/L. |
| Shelf Life | 2 years |
| Applications | Determination and monitoring of sulphite levels in food and wine as a preservative, in industrial water treatment (boiler feed water). |