The standard applies to surface water. Based on a sample volume of maximum 2 L, chlorophyll contents lower than 2 mg/m3 cannot be determined with sufficient accuracy. Note The method described in this standard can achieve an accuracy with a maximum difference of 5% between two duplicate determinations.
NEN 6520-1981 history
1981NEN 6520-1981 Water - Spectrophotometric determination of chlorophyll a content