College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China.
Water Environ Res. 2009 Nov;81(11):2381-6. doi: 10.2175/106143009x426059.
A rapid method to determine chemical oxygen demand (COD) in printing and dyeing wastewater using ultraviolet (UV) spectroscopy was developed in this study. The UV method has several advantages compared to the chemical method, such as shortened analysis time, convenience, no requirement of expensive and toxic reagents, and good reproducibility. It was established that the magnitude of COD and, to a certain extent, pH and suspended solids of the sample have effects on the accuracy and precision of the method. The results showed the fitting range of COD(Cr) (COD determined by the dichromate method) was 0 to 360 mg/L(-1) And the pH ranged from 2.45 to 9.22. If the UV(365) (UV absorbance at 365 nm) is measured and is subtracted from UV(254) (UV absorbance at 254 nm), then the effects of suspended solids was eliminated. A control experiment of COD(Cr) determination using the rapid method and the standard dichromate method was carried out, which validated the former.
本研究开发了一种利用紫外（UV）光谱法快速测定印染废水中化学需氧量（COD）的方法。与化学法相比，UV 法具有分析时间短、方便、无需使用昂贵有毒的试剂、重现性好等优点。结果表明，样品的 COD 浓度、一定程度上的 pH 值和悬浮物对方法的准确性和精密度有影响。结果表明，COD(Cr)（重铬酸钾法测定的 COD）的拟合范围为 0 至 360mg/L(-1)，pH 值范围为 2.45 至 9.22。如果测量 UV(365)（365nm 处的紫外吸收）并从 UV(254)（254nm 处的紫外吸收）中减去，则可以消除悬浮物的影响。对快速法和标准重铬酸钾法测定 COD(Cr)进行了对照实验，验证了前者的准确性。
