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元素磷对生物有很大的毒害。黄磷生产排放污水要求元素磷含量在0.05毫克/升以下。关于痕量元素磷的有机相比色测定已有报导,认为氯化亚锡—钼兰法操作手续较繁,且难掌握。所得“钼兰”颜色深度不仅与磷含量有关,且与溶液的酸度,试剂加入的方式、部位以及室温等因素都有很大关系。即使同一分析者仔细操作,虽每次所得标准曲线线性关系尚好,但不能重合。我们多次试验结果发现磷含量绝对值在1微克以下其吸光度基本上能重合;而含量大于3微克时其吸光度变化很大,同一含量其吸光度之差值达0.06之多。发现“钼兰”组成极为复杂,而酸度是一关键问题。试验结果表明,无论是氯化亚锡钼兰法或钼—锑—抗钼兰法,其最佳酸度均为0.5N,在此酸度,形成的“钼兰”最稳定。
Elemental phosphorus is very toxic to living things. Phosphorus production of sewage requires elemental phosphorus content below 0.05 mg / L. Organic trace colorimetric determination of trace elements of phosphorus has been reported, that the stannous chloride - Molybdenum method more complicated procedures, and difficult to grasp. The resulting “MOLYBD” color depth is not only related to the phosphorus content, but also has a great relationship with the acidity of the solution, the way of adding the reagents, the location and the room temperature and other factors. Even if the same analyst carefully manipulated, although each obtained standard curve is still a good linear relationship, but can not coincide. Our repeated tests showed that the absolute absorbance of phosphorus below 1 microgram absorbency basically coincide; and more than 3 micrograms when the absorbance changes greatly, the same content of the absorbance difference of up to 0.06 as much. Found that “Molan” composition is extremely complex, and acidity is a key issue. The results showed that the optimal acidity of both the molybdenum-tin-stannous chloride method and the molybdenum-antimony-anti-molybdenum-blue method was 0.5N.