Total cr content detection method in zinc sulfate contained chromate solution
A detection method and chromate technology, applied in the preparation of test samples, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of large errors and heavy detection results. Problems such as poor performance and large error in the detection result of chromium content can improve the accuracy and avoid the reduction
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Embodiment 1
[0011] 1. Add 30ml of 30% H in a 800ml beaker 2 SO 4 , And then put the sample with Φ=80mm, stir continuously at 20~25℃ to dissolve, until the dissolution is finished when the sample exposes the substrate metal. Transfer the dissolving solution and the eluent into a 100ml volumetric flask to a constant volume and shake it up. This solution is the total volume V of the sample solution.
[0012] 2. Transfer the appropriate volume (chromium content between 10 and 1000 μg) of the above solution into a 250ml Erlenmeyer flask, add 0.1g ammonium persulfate and 17g / l silver nitrate solution 3ml, boil for 30min, cool, and dilute with water to 80~ 90ml.
[0013] 3. To the above solution, slowly add 2% sodium carbonate solution in portions under stirring, until precipitation occurs, and then 5ml excess, slowly heat and boil for 2~3min, cool the running water to room temperature, transfer it to a 250ml volumetric flask, dilute the volume and shake well .
[0014] 4. Use a 40μm pore size filter...
Embodiment 2
[0019] 1. Add 30ml of 30% H in a 800ml beaker 2 SO 4 , And then put the sample with Φ=80mm, stir continuously at 20~25℃ to dissolve, until the dissolution is finished when the sample exposes the substrate metal. Transfer the dissolving solution and the eluent into a 100ml volumetric flask to a constant volume and shake it up. This solution is the total volume V of the sample solution.
[0020] 2. Transfer the appropriate volume (chromium content between 10 and 1000μg) of the above solution into a 250ml Erlenmeyer flask and heat it to boil, add 5ml of 1% potassium permanganate solution, continue to boil until all the manganese dioxide is precipitated, cool and use water Dilute to 80~90ml.
[0021] 3. To the above solution, slowly add 20% sodium carbonate solution in batches with stirring until precipitation occurs and then 5ml excess, slowly heat and boil for 2-3min, cool the running water to room temperature and transfer it to a 250ml volumetric flask, dilute the volume and shake w...
Embodiment 3
[0026] 1. Transfer an appropriate volume of chromate solution containing zinc sulfate (with chromium content between 10 and 1000μg) into a 250ml conical flask, add 0.1g ammonium persulfate and 17g / l silver nitrate solution 3ml, boil for 30min, Cool and dilute with water to 80~90ml.
[0027] 2. To the above solution, slowly add 35% sodium bicarbonate solution in portions with stirring until precipitation occurs and then 5ml excess, slowly heat and boil for 2~3min, cool the running water to room temperature and transfer it to a 250ml volumetric flask, make the volume constant, shake uniform.
[0028] 3. Use No. 3 microporous sand core to dry filter the above solution.
[0029] 4. Pipette an appropriate amount of the above-mentioned filtrate (chromium content between 2-40μg) into a 250ml volumetric flask, dilute with water to 80-90ml, add 25ml of 35% phosphate buffer, and add 40% H 2 SO 4 Solution 3ml and 0.5% diphenylcarbazide indicator (solvent 94ml ethanol and 6ml glacial acetic aci...
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