The standard applies to water with a SiO2 content between 1 and 100 mg/l. Comments 1. The determination is interfered with by phosphate. This fault is remedied by adding tartaric acid. 2. To determine the total silicate content, consult NEN 3130 Si02.2. 3. For the determination of SiO2 contents between 0.02 and 25 mg/l, see NEN 3130SiO2.3.
NEN 6471-1981 history
1981NEN 6471-1981 Water - Photometric determination of silicate content