The invention discloses a quantitative monitoring method for
hexavalent chromium in foil washing water. The quantitative monitoring method comprises the following steps that
hexavalent chromium standard color developing solutions of different concentrations are prepared, and a
standard curve is made; the foil washing water to be tested is diluted to a required concentration, two 25mL volumetric flasks are taken, one
volumetric flask is filled with mixed acid, a color developing agent and the diluted foil washing water to be tested, constant volume and uniform shaking are performed to obtain liquid to be tested, the other
volumetric flask is filled with
ultrapure water, mixed acid and a color developing agent, constant volume and uniform shaking are performed to obtain a blank sample, and the
hexavalent chromium content in the liquid to be tested is determined according to the obtained
standard curve; and the actual hexavalent
chromium content of the foil washing water to be tested is calculated according to the hexavalent
chromium content in the liquid to be tested. The method is simple in operation, low in cost and high in analysis speed, can accurately determine the concentrationof the hexavalent
chromium in the foil washing water, and effectively monitors the hexavalent chromium concentration in a
water body, thereby reducing the difficulty of treating hexavalent chromium waste water.