Method for determining copper content in water by biquinolyl spectrophotometry
A spectrophotometry, biquinoline technology, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of long time, complex measurement process, etc., to avoid effect of error
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Embodiment 1
[0024] The detection biquinoline spectrophotometric method of water quality copper comprises the following steps:
[0025] 1. Scope of application
[0026] (1) This detection method is applicable to the determination of copper in surface water, domestic sewage, and industrial wastewater in the laboratory; (2) This detection method is applicable to the determination of copper in surface water, domestic sewage, and industrial wastewater by online automatic detection instruments Determination.
[0027] The optical path of the cuvette is 10mm, the minimum detection limit of copper is 0.1mg / L, and the detection limit is 7mg / L.
[0028] 2. Definition: (1) Soluble copper: unacidified water sample, copper concentration measured after passing through a 0.45um filter membrane; (2) total copper: unfiltered water sample, copper measured after vigorous digestion concentration.
[0029] 3. Principle. Use hydroxylamine hydrochloride to reduce divalent copper ions to cuprous ions. In a sl...
Embodiment 2
[0065] Embodiment 2: the detection biquinoline spectrophotometry of water quality copper is characterized in that comprising the following steps:
[0066] (1) Make copper standard stock solution: weigh 0.0999-0.10001g of polished electrolytic copper wire or copper foil, place it in a conical flask, add 10mL of water and ρ 20 =1.40g / mL nitric acid 5mL nitric acid, heat to dissolve all the copper, boil the solution to drive off nitrogen oxides, add 50mL water after the solution is cooled, quantitatively transfer to a 1000mL volumetric flask, dilute with water to the mark and mix well;
[0067] (2) Sampling and samples: Collect 1000mL of the water sample to be tested, take two uniform samples from the water sample, and place 100mL of each in a beaker as a digestion sample;
[0068] (3) detection, specifically comprising the following steps:
[0069] ① Calibration: Use seven volumetric flasks, respectively add 10mL of copper standard solution of 1.00mg / L, 2.00mg / L, 3.00mg / L, 4.00...
Embodiment 3
[0082] Embodiment 3: the detection biquinoline spectrophotometry of water quality copper is characterized in that comprising the following steps:
[0083] (1) Make copper standard stock solution: weigh 0.0999-0.10001g of polished electrolytic copper wire or copper foil, place it in a conical flask, add 10mL of water and ρ 20 =1.40g / mL nitric acid 5mL nitric acid, heat to dissolve all the copper, boil the solution to drive off nitrogen oxides, cool the solution, add 50mL water after the solution is cooled, quantitatively transfer to a 1000mL volumetric flask, dilute with water to the mark and mix well ;
[0084] (2) Sampling and samples: Collect 1000mL of the water sample to be tested, take two uniform samples from the water sample, and place 100mL of each in a beaker as a digestion sample;
[0085] (3) detection, specifically comprising the following steps:
[0086] ① Calibration: Use seven volumetric flasks, respectively add 10mL of copper standard solution of 1.00mg / L, 2.0...
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