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Simple and efficient dual-wavelength spectroscopy for the determination of organic matter in sewage sludge from wastewater treatment

机译：简单高效的双波长光谱法测定废水处理污泥中的有机物

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In this study, a dual-wavelength spectroscopic method for rapid determination of organic matter in sludge was developed. The contents of the organic matter were calculated by determining the consumption of potassium dichromate (K _(2) Cr _(2) O _(7) ) based on the production of trivalent chromium ions (Cr ~(3+) ). Cr ~(3+) could be determined by subtracting the absorption at 800 nm (spectral interference) from the absorption at 650 nm (only contributed by Cr ~(3+) ). The results showed that the relative standard deviation in the test was less than 5%. The same set of samples was used and when the content of organic matter was more than 150 g kg ~(?1) , the relative difference between the spectroscopic method and titration method was within 1%. Furthermore, the method does not require calibration based on the standard samples. In conclusion, the present method is simple, reliable, accurate and suitable for application in mass testing for sludge samples.
机译：在这项研究中，开发了一种双波长光谱法快速测定污泥中的有机物。通过基于三价铬离子（Cr〜（3+））的产生确定重铬酸钾（K _（2）Cr _（2）O _（7））的消耗量来计算有机物的含量。 Cr〜（3+）可以通过从650 nm处的吸收中减去800 nm处的吸收（光谱干涉）来确定（仅由Cr〜（3+）贡献）。结果表明，测试中的相对标准偏差小于5％。使用同一组样品，当有机物含量大于150 g kg〜（？1）时，光谱法和滴定法之间的相对差在1％以内。此外，该方法不需要基于标准样品的校准。总之，本方法简便，可靠，准确，适用于污泥样品的质量检测。

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