Determination of TOC in ecological restoration wastewater
author: Otis
2023-01-12
1.Introduction
Optosky Total organic carbon analyzer, used to detect the content of total organic carbon in liquid / solid samples, suitable for pharmaceutical water, ultra-pure water, tap water, surface water, surface water, sewage, waste water, seawater, fermented liquid and other water quality and pre-treated plant analysis. It can be widely used in the following fields: university scientific research, municipal water supply and drainage, water treatment, electric power, water conservancy, agriculture, environmental protection, ocean, etc.2.Sample processing
Number of samples: 10 water samples, the sample is cloudy, after natural settlement, take the supernatant, direct injection without dilution.3.Experimental conditions
Combustion temperature: 800℃Method parameters: TOC
Number of measurements: 2-3 times
Integral time: 220s
Injection volume: 100 pL
4.For the calibration curve
IC correction curves were drawn using sodium carbonate and sodium bicarbonate and TC correction curve, potassium hydrogen phthalate, potassium nitrate and The TN correction curves were plotted for ammonium sulfate.
IC curve: R=0.9995
TC curve: R=0.99998
TN curve: R=0.99991
| Sample name | TOC mg/L | IC mg/L | RSD % | TC mg/L | RS D % |
| No treatment | 42.36 | 70.33 | 0.68 | 112.7 | 0.94 |
| 11C | 27.06 | 77.43 | 1.55 | 104.5 | 0.54 |
| 11 | 22.93 | 76.91 | 0.08 | 99.84 | 0.06 |
| 12A | 18.93 | 64.31 | 1.52 | 83.23 | 0.91 |
| 12B | 18.63 | 65.43 | 0.11 | 84.07 | 1.04 |
| 12C | 20.56 | 65.28 | 0.88 | 85.84 | 0.40 |
| 12 | 19.69 | 58.28 | 1.62 | 77.97 | 1.07 |
| 13C | 10.81 | 43.69 | 1.56 | 54.50 | 1.59 |
| 13 | 9.59 | 47.39 | 0.59 | 56.98 | 0.07 |
6.Sample profile
IC peak pattern
7.Conclusion
In this experiment, 10 samples had obvious odor, and the samples may contain volatile organic compounds. Therefore, the TOC content was determined by difference subtraction. Meanwhile, in order to avoid the loss of volatile organic compounds, the sample bottle was sealed with aluminum foil.
The samples have different colors and particulate matter content. In this experiment, the method of natural settlement was adopted to precipitate the large particles, and the fine suspended matter entered the reactor together with the sample, so as to make the TOC expression of the water sample more complete as far as possible.(If the uneven distribution of particulate matter, it may cause poor reproducibility)
According to the data, the RSD of the samples is within 2%, the peak type coincides, and the zero is complete, indicating that the sample digestion ability is good and the instrument performance is stable. Optosky Total organic carbon analyzer determines reliable TOC content in turbidity, high IC value and ecological restoration wastewater containing volatile organic compounds.
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