Phosphoric acid and when the measuring method null phosphoric acid of the thin arsenic concentration under

摘要

PROBLEM TO BE SOLVED: To detect arsenic with low concentration which may be contained in mining waste water, etc. in a short time.;SOLUTION: A method for measuring thin arsenic concentration in a sample liquid in which phosphoric acid and a silica ion exist, based on flow injection analysis using ammonium molybdate consists of: a first step of reacting the sample with an oxidant or a reductant; and a second step of reacting the reacted sample with a coloring agent. The reaction temperature with the coloring agent is about 70°C, and the reaction time is about 1.4 minutes. The sample liquid, a standard liquid, an oxidant solution, and a reductant solution are carried to a duct for measurement by a carrier (water), and sodium dodecyl sulfate is dissolved and added to a coloring agent solution and the carrier.;COPYRIGHT: (C)2012,JPO&INPIT