The suspended solids level in brine and concentrated brine storage tank V-409 is 1.8 mg/l; can this indicate that the levels of calcium and magnesium ions are above the permissible limits?
Thread Content
In the brine and concentrated brine storage tank V-409, the suspended solids level was 1.8 mg/l (the specified limit is 1 mg/l); can this indicate that the levels of calcium and magnesium ions are above the allowed limits? It should be noted that there were issues with the control of the normal saline, but the V-409 samples remained qualified throughout. Does this indicate that there are problems with the analysis results? Or put it this way, do analysts engage in fraud?
We also encounter such problems; it’s hard to say, and it’s difficult to identify the cause as well – it’s tricky
Run an ICP test to see the results; these results are quite accurate. SS is based on manual analysis, and the results are influenced by many factors. Among them, the precipitation of salt may have a significant impact. Carefully (a magnifying glass is necessary) examine what’s on the filter paper – are they crystals or impurities?
Run an ICP test to see the results; these results are quite accurate. -----A saltwater sample can only be analyzed using ICP after being greatly diluted, and as a result, it is difficult to obtain accurate results.
Run an ICP test to see the results; these results are quite accurate. -----A saltwater sample can only be analyzed using ICP after being greatly diluted, and as a result, it is difficult to obtain accurate results.
It’s hard to say; samples can be taken simultaneously for supervisors and analysts to examine, so as to obtain the actual data.
We diluted it 50 times; now the sampling tool provides more accurate measurements, so the deviation in the results should not be significant. For example, in saline with 800 ppb of calcium, a deviation of several dozen ppb in the analysis results is not significant. Moreover, the data remains relatively stable each time
Refined brine has a very high salt concentration, essentially approaching saturation. Although the solubility of sodium chloride is not greatly affected by temperature, it is possible for a small amount of salt crystals to precipitate when there are temperature fluctuations, especially at low temperatures. I have seen this situation before at the chlor-alkali plant of Qilu Petrochemical. Therefore, I believe that a high level of suspended solids in refined saltwater does not necessarily mean that the calcium and magnesium contents are above the limit. It is objective to make a judgment based on the analysis results; in addition, check the temperature fluctuations as well. Analyzing calcium and magnesium in high-concentration saline is difficult using ICP directly; it might be better to first evaporate and concentrate the saline to remove most of the salts, and then conduct the calcium and magnesium analysis (by appropriately diluting the mother solution without affecting the analysis results).
Generally, excessive SS levels result in unacceptable levels of Ca and Mg; this cannot be detected by the once-daily brine titration method, while ICP testing can be performed once a day, and it is possible to detect this through SS levels； to judge
1. The fact that such a large volume of brine in the storage tank still shows unsatisfactory test results indicates that this concentrated brine issue did not arise suddenly. 2. Testing errors. 3. Interfering factors, including external contaminants and sampling issues