| http://www.w3.org/ns/prov#value | - On the other hand, where concentrations are below levels in these vicinities, the conventional DPD test procedure is more suitable, as this test is designed for measuring very low active halogen concentrations, e.g., active chlorine concentrations in the range of from zero to about 11???12 ppm (wt/wt) or active bromine concentrations in the range of from zero to about 5 ppm (wt/wt).
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