Long-acting calibration reagent for turbidimetry determination of sulfate and use method thereof
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A technology for calibrating reagents and sulfates, which is used in measurement devices, measurement of scattering properties, and analysis by chemical reactions of materials. Unlimited time, the effect of shortening the preparation time
Inactive Publication Date: 2021-03-30
SHANGHAI YIDIAN SCI INSTR +1
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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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Embodiment 1
[0072] Quick field test verification:
[0073] Prepare 10mg / L, 20mg / L, 40mg / L, 50mg / L, 80mg / L, 100mg / L sulfate calibration solutions, pipette 15ml into 6 clean colorimetric bottles, add 0.5ml of stabilizer solution and a packet of barium chloride powder. Tighten the cap of the vial and shake until the powder is completely dissolved.
[0074] Record the current value of the sulfate calibration solution with different concentrations every few minutes, and observe how long it takes for the current value to stabilize.
[0075] Table 1 below shows the trend value of the relative current value corresponding to each concentration over time. From the data analysis in the table below, it can be seen that as the barium chloride powder dissolves, the current value decreases with time, until the current value tends to be stable after about 30 minutes, and then changes little with time. pass figure 1 From the 5-minute curve and the 30-minute curve, it can be concluded that although the...
Embodiment 2
[0080] Laboratory bulk sample test verification:
[0081] (1), prepare 10mg / L, 20mg / L, 40mg / L, 50mg / L, 80mg / L, 100mg / L sulfate calibration solutions, respectively pipette 15ml into 6 clean colorimetric bottles, add 0.5ml stabilizer solution and a pack of barium chloride powder; tighten the cap of the colorimetric bottle and shake until the powder is completely dissolved; let it stand for 30 minutes before testing.
[0082] (2) Shake the above-mentioned 50mg / L sulfate calibration reagent colorimetric bottle until there is no white precipitate at the bottom of the bottle, insert it into the colorimetric cell, close the hood tightly, and calibrate at zero after the current value is stable.
[0083] (3) Shake the 10mg / L calibration reagent colorimetric bottle and the 100mg / L calibration reagent colorimetric bottle vigorously until there is no white precipitate at the bottom of the bottle, respectively insert them into the colorimetric cell, cover the hood tightly, and wait for the...
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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...
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Application Information
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