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51.
根据EDTA滴定法测定水质总硬度的实践经验,对EDTA滴定法进行改进,该改进方法和标准方法通过地表水、地下水以及总硬度标准样品的比对测定,实验证明改进方法测定结果准确、可靠,操作更加简便、快捷。 相似文献
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Feihu Yao Hailong Liu Guangquan Wang Liming Du Xiaofen Yin Yunlong Fu 《环境科学学报(英文版)》2013,25(6):1245-1251
Paraquat (PQ), a nonselective herbicide, is non-fluorescent in aqueous solutions. Thus, its determination through direct fluorescent methods is not feasible. The supramolecular inclusion interaction of PQ with cucurbit[7]uril was studied by a fluorescent probe titration method. Significant quenching of the fluorescence intensity of the cucurbit[7]uril-coptisine fluorescent probe was observed with the addition of PQ. A new fluorescent probe titration method with high selectivity and sensitivity at the ng/mL level was developed to determine PQ in aqueous solutions with good precision and accuracy based on the significant quenching of the supramolecular complex fluorescence intensity. The proposed method was successfully used in the determination of PQ in lake water, tap water, well water, and ditch water in an agricultural area, with recoveries of 96.73% to 105.77%. The fluorescence quenching values (ΔF) showed a good linear relationship with PQ concentrations from 1.0×10-8 to 1.2× 10-5 mol/L with a detection limit of 3.35×10-9 mol/L. In addition, the interaction models of the supramolecular complexes formed between the host and the guest were established using theoretical calculations. The interaction mechanism between the cucurbit[7]uril and PQ was confirmed by 1H NMR spectroscopy. 相似文献
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In this study, we added increments of acid and base to three calcareous soils from the eastern, middle and western parts of Gansu Province (China) and to three treated soils to remove calcium carbonate, organic matter and both carbonate and organic matter, respectively. the titration curves were measured and the magnitudes of buffer capacities as a function of pH were computed. It was found that the buffer capacity of calcareous soil is mainly attributed to calcium carbonate, as expected from the chemical composition of calcareous soil, while cation exchange system, silicate buffer system and organic matter play a minor role. the results clearly show that these soils of Gansu Province will not become a problem in the near future from the entrance of H+ into these soils. 相似文献
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测定挥发性脂肪酸(Volatile fatty acid,VFA)浓度的方法包括:蒸馏法、比色法、气相色谱法以及各种滴定法。就常规监测和控制而言,滴定法在简洁、省时和成效比方面要优越于其它测试方法。滴定法测定VFA主要包括四点滴定法、五点滴定法和八点滴定法。这些方法主要应用于厌氧反应器中高浓度VFA的测定,但随着活性污泥数学模型的应用,城市污水中低浓度VFA的测量越加重要,是模型应用不可缺少的条件。文章具体介绍了上述三种滴定方法的基本原理、优缺点和应用情况,为适用于城市污水中VFA测量提供参考。 相似文献
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采用碘量法测定硫化物中值得注意的几个问题 总被引:8,自引:0,他引:8
针对碘量法测定水样中硫化物含量时硫离子具有较强的还原性,对测定结果影响较大的问题,提出了为减少测定误差采取的一些措施。 相似文献
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用测量不确定度表示检测结果是当前国际上约定做法,然而如何对测量结果的不确定度进行合理评定,一直是困扰检测实验室的一个难题。作者依据测量不确定度的评定原则,通过实例,简要地阐述了滴定法测量不确定度评定方法,对环境检测领域测量不确定度的评定具有借鉴意义。 相似文献