The test kit is extremely accurate – at Megazyme the quality control criteria for accuracy and repeatability is to be within 10% of the expected value using pure analytes.  Due to the characteristic instability of aqueous sulphite samples, recoveries of less than 100% should be expected.  This is consistent with values obtained with other commercially available enzymatic sulphite test kits.  However, the level of accuracy is obviously analyst and sample dependent.

Product Page (K-ETSULPH)