Heavy Metals as Lead (FAO Method)
Heavy metals (Ag, As, Bi, Cd, Cu, Hg, Pb, Sb and Sn) are precipitated as their corresponding sulphides using a saturated H2S solution. The turbidity of the sample is compared to a standard containing only lead that is treated in the same way as the sample.
Note: This analysis is only performed on food grade calcium chloride.
| Normal Measuring Range |
Flakes < 20 mg/kg
Solution < 7 mg/kg |
| Quantification Limit |
N/A |
Note: The results should be interpreted as, "less than 20 mg/kg" or "less than 7 mg/kg" of heavy metals as lead." | 
