Detection method for rapidly and qualitatively testingcontent of nickel ions in wastewater treatment

Abstract

The invention discloses a detection method for rapidly and qualitatively testing the content of nickel ions in wastewater treatment. Detection reagents comprise a 2mol / L NH4OH solution, a 1% butanedione depletion solution and a nickel standard solution (Ni < 2 + > is equal to 0.5 mg / L). The detection method comprises the following steps: taking two colorimetric tubes, and respectively injecting a nickel standard solution (Ni < 2 + > = 0.5 mg / L) and treated nickel wastewater (if the nickel wastewater is not clear, the nickel wastewater can be settled or filtered); adding 2 mol / L NH4OH solutions into the two colorimetric tubes respectively to enable the solution to be slightly alkaline, and then adding 1% butanedione depletion solutions into the two colorimetric tubes respectively; and standing for 3-5 minutes, and comparing the colors of the two colorimetric tubes. The judging method comprises the following steps: if the color of the nickel-containing wastewater colorimetric tube is more red than that of a nickel-containing standard solution colorimetric tube, indicating that nickel exceeds the standard, and continuing to treat; and if the color of the nickel-containing wastewater colorimetric tube is lighter or colorless than that of the nickel-containing standard solution colorimetric tube, indicating that the nickel wastewater is qualified and can be discharged after reaching the standard. The method is simple to operate, economical in investment cost and rapid in detection, whether the wastewater is qualified or not can be judged through direct observation, and convenience is provided for on-site detection.

Description

technical field [0001] The invention relates to the field of wastewater detection, in particular to a detection method for rapid qualitative testing of nickel ion content in wastewater treatment. Background technique [0002] Industrial wastewater refers to the wastewater and waste liquid discharged during the production process, which contains industrial production materials, intermediate products, by-products and pollutants generated during the production process that are lost with water, and is an important source of environmental pollution, especially water pollution. reason. Common industrial wastewaters include nickel-containing wastewater, of which there are mainly three kinds of nickel-containing wastewater, including electroplating nickel wastewater, chemical nickel wastewater, and zinc-nickel alloy wastewater. Among them, electroplating nickel wastewater only contains ordinary nickel ions, and nickel is in a divalent form. The ions exist in the wastewater. Except ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the detection method of the current nickel-containing wastewater mostly to detect whether the wastewater exceeds the standard through the nickel ion detection equipment after sampling. It is not as convenient as on-site detection and other shortcomings, but a rapid qualitative detection method for the detection of nickel ion content in wastewater treatment is proposed

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