二氧化锡催化型碳糊电极测定染料废水中有机物-环境科学专业论文.docx

测限都为1.0×10-6mol·L-1，峰电流与苯酚和苯胺的浓度也都在 5.0×10-6mol·L-1到2.5×10-4mol·L-1之间呈线性相关关系，相对标准偏差 为5.53%和6.31%。并且研究发现低于5倍苯酚浓度的苯胺基本不干扰 苯酚的测定（RSD=7.02%）；而低于8倍苯胺浓度的苯酚基本不干扰苯 胺的测定。将此方法用于模拟染料废水的测定也取得了良好的效果， 测定得到回收率在93.7%到122.6%之间，测定结果的相对误差为 6%~8.4%。 关键词：苯酚，苯胺，二氧化锡，碳糊电极，线性扫描伏安法，电化 学检测 Voltammetric Detection of organics in waste water from dyestuff industry at SnO2-modified Carbon Paste Electrode ABSTRACT As the enforcement of energy saving and emission reduction, there is a higher request of continuous monitor. The original solid electrodes are easy to be interrupted. As a contrary, carbon electrode is cheaper and easier to be refreshed. And how to raise the sensation has always been a key problem. Chemically modified electrode is widely used nowadays. But at the moment, most of the modifications are adsorption type or mixture type. Adsorption modification can increase the sensitivity, because it can increase the quantity of the contamination. But this kind of modification usually brings new containment which may be oxidized during the reaction. So it may disturb the result. Mixture modification has a high request of equality, so the handling situation can be very rigor. As a result, this essay brings forward a new type of modification, SnO2, which can intensify the oxidization ability of the electrode, and then increase the sensitivity of the system. But different from the original mixture method, we developed a electroplated modification method. This method electroplates SnO2 on the carbon powder, so the SnO2 can be more equally distributed, and the new modified carbon electrode has a higher level of stability and performance. After made this new type of modified carbon electrode, the factors which may influence the result, such as scan rate，accumulation time ，and pH have been studied. The study shows that The study showed that a sensitive oxidation peak of phenol appeared at + 0.85 V in 0.2mol·L-1phosphate buffer (pH 5. 0), and the peak current under the same conditions for the ba