Long-acting calibration reagent for turbidimetry determination of sulfate and use method thereof

Abstract

The invention discloses a long-acting calibration reagent for turbidimetry determination of sulfate and a use method, the long-acting calibration reagent comprises a solvent formed by mixing three sulfate calibration solutions with different concentrations with a stabilizer and barium chloride powder respectively, and during mixing, the barium chloride powder corresponding to every 15ml of the sulfate calibration solution is not less than 0.2 mg; wherein the concentrations of the three sulfate calibration solutions with different concentrations are 10-50mg / L, 50mg / L and 50-100mg / L in sequence;wherein the sulfate calibration solution with the concentration of 50 mg / L is a zero calibration solution. The preparation method of the stabilizer comprises the following steps: dissolving sodium chloride into water, adding concentrated hydrochloric acid, glycerol and ethanol, uniformly mixing, and standing for one week for later use; wherein the barium chloride powder is a 20-40-mesh dihydratecrystal. The application method comprises two methods of laboratory large-batch test and field rapid test. According to the invention, the operation of testing sulfate by a turbidimetric method is simplified, different measurement methods are provided for different occasions, and the detection speed and the accuracy of a measurement result are improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric colorimetry analysis, and in particular relates to a long-acting calibration reagent for measuring sulfate by turbidimetry and a use method. Background technique [0002] The concentration of sulfate in natural water varies from a few mg / L to thousands of mg / L. Industrial wastewater usually contains a large amount of sulfate produced by the use of sulfuric acid as a pyrite oxidant. Sulfur-containing organic matter and discharged industrial wastewater are both sources of sulfate. When the sulfate concentration is 300-400mg / L, most drinkers begin to perceive the taste. In the presence of magnesium ions or sodium ions, sulfate has a laxative effect when it exceeds 250mg / L. Sulfates in process and domestic water supplies can be both beneficial and harmful. In the wine industry, sulfates contribute to specific flavors. In the domestic water supply system, low concentration of sulfate will not...

AI Technical Summary

Problems solved by technology

Among them, ion chromatography is a better method for determining sulfate at present, but the corresponding equipment is relatively expensive, and it cannot be widely used in the basic water quality analysis room.

The detection range of barium chromate spectrophotometry is (5-200) mg / L, but it needs to be heated and filtered, and the operation process is cumbersome, so it is not suitable for batch and field rapid testing

Barium sulfate turbidimetry can measure sulfate below 40mg / L. This method is simple to operate, but the reaction conditions are harsh and affected by many factors, so strict control of operating conditions is required.

In the prior art, many documents have optimized the barium sulfate turbidimetric method, most of which are to speed up the reaction speed and control the stabilization time by stirring with a stirrer, and use the stirrer to stir to speed up the reaction time, which is not conducive to rapid determination on the spot. There are also many The barium sulfate turbidimetric method for testing sulfate is mostly added to dissolve barium chloride powder and read after 5 minutes of timing; while each sample needs to be timed for 5 minutes, which is not conducive to mass testing

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