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铜铅锌
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  cu pb and zn
    Flame Atomic Absorption Spectrometric Determination of Cu, Pb and Zn in Water through Concentration on HCS-g-MMANHNH_2
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    Determination of Active Arsenic Species in Soil Sediments Using a Modified Electrode
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Rapid polaropraphy with the mercury film electrode was applied to the simultaneous determination of Cu2+, Pb2+, Cd2+ and Zn2+ in water. When these ions were electrolyzed in 0.15M NH4Gl medium for 10 min. at -1.3V (VS. Ag- Hg electrode), the metals were elcctrodeposited on a mercury film electrode, and an anodic dissolution curve was recorded by an X-Y functional recorder from -1.3V to -0.1V. The peak heights were linear with concentrations within the range or 10-6M-10-8M for Cu, Pb, Zn and of 10-6M-10-9M for...

Rapid polaropraphy with the mercury film electrode was applied to the simultaneous determination of Cu2+, Pb2+, Cd2+ and Zn2+ in water. When these ions were electrolyzed in 0.15M NH4Gl medium for 10 min. at -1.3V (VS. Ag- Hg electrode), the metals were elcctrodeposited on a mercury film electrode, and an anodic dissolution curve was recorded by an X-Y functional recorder from -1.3V to -0.1V. The peak heights were linear with concentrations within the range or 10-6M-10-8M for Cu, Pb, Zn and of 10-6M-10-9M for Cd. This method is suitable for the determination of trace amounts of these elements in water.

快速极谱仪与汞膜电极联用,阳极溶出伏安法同时测定水中铜、铅、镉、锌。在O.15MV氯化铵介质中,调节pH至5.5,于一1.3伏电解10分钟(对Ag-Hg电极),这些金属便电沉积在汞膜电极上,并用记录仪于-1.3伏~-0.1伏记录阳极溶出曲线。10~(-6)M~10~(-8)M的铜、铅、锌和10~(-6)M~10~(-9)M的镉,其浓度与峰高呈线性关系。此法适用于测定水质中的这些痕量元素。

It is found experimentally that mandelic acid is an excellent masking agent for titanium (Ⅳ) at pH 3.0 to 7.0. It can quantitatively displace EDTA from the Ti-EDTA complex without the interference from zirconium, thorium, iron, bismuth, aluminum, gallium, indium, cerium and other rare earths, copper, lead, zinc, nickel, cobalt, cadmium, manganese etc.It is also found that mandelic acid is much superior to lactic acid, which was found to be a good masking agent for titanium. When the EDTA displaced from the Ti-EDTA...

It is found experimentally that mandelic acid is an excellent masking agent for titanium (Ⅳ) at pH 3.0 to 7.0. It can quantitatively displace EDTA from the Ti-EDTA complex without the interference from zirconium, thorium, iron, bismuth, aluminum, gallium, indium, cerium and other rare earths, copper, lead, zinc, nickel, cobalt, cadmium, manganese etc.It is also found that mandelic acid is much superior to lactic acid, which was found to be a good masking agent for titanium. When the EDTA displaced from the Ti-EDTA complex with lactic acid was titrated with a standard nitrate solution, the end point only lasted for 10 to 20 seconds if aluminium was present, because lactic acid could slowly displace EDTA from the Al-EDTA complex. We found that mandelic acid does not mask aluminum. This makes possible the stepwiso titrations of iron, titanium and aluminum using mandelic acid and ammonium fluoride as masking agents.

本文研究苦杏仁酸的隐蔽性能,发现它在pH2.5至7.0为钛(Ⅳ)的优良隐蔽剂,隐蔽能力随pH的增大而稍有降低。苦杏仁酸能置换络合钛的EDTA.在pH3~5.5,锆、钍、铁、铋、铝、镓、镧、铈、稀土、铜、铅、锌、镍、钴、镉、锰等不干扰置换滴定。本文发现苦杏仁酸不隐蔽铝,即使有大量铝时,也能准确地置换滴定钛。因此,苦杏仁酸比乳酸更为优越。本试验确定苦杏仁酸为钛的选择陸很高的隐蔽剂,故可能连续滴定铁铝钛。

The stability constant of Fe(III)-EDTA complex is rather large (logK = 25.1). Iron should be titrated at as low as pH 1, but owing to no suitable indicator to give a sharp end point, it has to be titrated at pH 2-3, which minimizes the selectivity of the titration. Through the comparison of the absorption curves of Bi-xylenol orange complex at different pH values, we found that at a wave length of 540 nm and at pH 0,8, the end point of the spectrophotometric titration of bismuth still was very clear. So we chose...

The stability constant of Fe(III)-EDTA complex is rather large (logK = 25.1). Iron should be titrated at as low as pH 1, but owing to no suitable indicator to give a sharp end point, it has to be titrated at pH 2-3, which minimizes the selectivity of the titration. Through the comparison of the absorption curves of Bi-xylenol orange complex at different pH values, we found that at a wave length of 540 nm and at pH 0,8, the end point of the spectrophotometric titration of bismuth still was very clear. So we chose bismuth nitrate as the back titrant in the back titration of iron at a much lower pH value.This paper reports the optimum conditions for the spectrophotometric titration of 3-100Mg of iron in about 30 ml volume. The selectivity of this method is very high. 1 to 2 mg of Al, Ti(IV), Cr(III), Cu, Pb, Zn, Mn, La, Ce(III), W(VI), Mo(VI), V(Y), As(I), Mg, Ca and Ag, and 100ug of Hg, Sb(III), Ni and Th, as well as large amounts of chloride, fluoride and phosphate anions do not interfere. Using ammonium fluoride as a masking agent, 10 mg of Al, 200 ,ug of Zr and 100 Mg of Sn(IV) can be tolerated. Sodium sulfate can mask thorium up to 500 Mg. Co(II) is the only cation that interferes, and in the presence of EDTA it is easily oxidized to Co(III), which is cotitrated with iron.Micro-quantities of iron in quartz, tap water, aluminium alloys and pure aluminium, without preliminary separation, can be successfully and accurately determined with this method.

本文提出在pH=0.8和波长540nm,以二甲酚橙作指示剂,用铋盐作回滴剂光度滴定3—100微克铁。本法选择性很高,大量铝、钛(Ⅳ)、铬(Ⅲ)、铜、铅、锌、镉、锰、镧、铈(Ⅲ)、钨(Ⅶ)、钼(Ⅵ)、钒(Ⅴ)、砷(Ⅲ)、镁、钙、银以及适量的汞、钍、锑(Ⅲ)、镍、氟离子、氯离子和磷酸根等不干扰,应用适当的隐蔽剂,400倍于铁的铝以及适量的钍、锆和锡也不干扰。应用本法,不必分离便可滴定石英石、石英砂、铝合金、纯铝以及水样中的铁。

 
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