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Titrimetric Determination of the iron carbide, nickel and cobalt


For the background agent, can effectively remove the interference color of colored complex, the titration end point from the green to blue-violet light, clear color change, easy to observe. Experiments showed that adding 2 drops of 0.2 malachite green and xylenol orange 4 drops of 0.5 when the color change is most clear in the titration of Ni, Co component, and when Barry joined murexide agent phenolphthalein as background, so that the green fluorescence clear end point changed significantly. No background agent is added, the color of iron and nickel complexes are the green fluorescent blur. Changes are difficult to see the end. Green fluorescence should be in the black backing on the side from the light green fluorescence was clearly visible. 3.6 The influence of coexisting ions in the hard Taijin tungsten matrix elements when dissolving into the solution and not with Fe, Ni, Co separation. Other impurity elements into the solution because of its content below 0.01,[link widoczny dla zalogowanych], the interference can be ignored. In the determination of Ni, Co component, the presence of iron will have a serious interference, masking can be used three ethanol discrimination. 3.7 Sample analysis 0.1000 g accurately weighed samples of two T series in 100ml beaker, add 1:1 HNo35ml, on the low electric heat 5 minutes, remove with a rapid qualitative filter paper, washed with distilled water 3 times Yan , the filtrate was collected in the 300ml beaker, by titration experiments were total Fe + Ni + Co and Ni,[link widoczny dla zalogowanych], Co component. At the same time with ammonia, dimethylglyoxime precipitation step after the separation of the three elements of the three elements with the EDTA titration method, respectively, as control, sample analysis results were shown in Table 1 and Table 1, corresponding to 170 samples plus the standard recovery * Management Quality Music Box No. 15 7.126.6l6.948.322, 061.94l602.271652.522.134.532.004.003002.004.006.008.003.00002.501.000.054. 054.5910.596.004.549.9O7.624600.2710.255.5596.597598.099.51Ol5lO1.099.0100.398.895.099.8l0204 Conclusion This method is used to Fe, Ni instead of Co, some of T Series carbide in the Fe, Ni,[link widoczny dla zalogowanych], c0 analysis, without separation, simplified analysis procedures, greatly improving the speed of analysis. Looking at the results from the determination of the method accuracy and precision are in line with the requirements of constant analysis. References 1 Wu Yushuang. Rare and Hard Taijin,[link widoczny dla zalogowanych], 1996, (2) a fine 4O2 Beijing Institute of Mining Code. Ores and nonferrous metals analysis Science Press. 19733 Ministry of Metallurgical Industry standards. Chemical analysis of iron and steel, YB35 (9) - 78DETERMINAT1oNoFFERRUM, NICKELANDCoBALTINCEMENTEDCARBIDEBYRESIDUALTlTRAT1oNWuYushuang (PowderMetallurgyFactoryofCemral-sorthUniversityofTechnology) BSTRCTTtotalcoDtentofFe. NiandCocanbedeterminedbyresidualtitrationinpH5.5 ~ 6.0, andinviewofthedifference. ftheeffectivestabilitycoqlst & nt $ ofcheEDTAcomplexesofNiandCoinstrongalkalinemedium, NiandCoc lying beder-erminedcontinuouslybyresualtitrationwithca1ciu add salt, theimefenceofFe bleed at the nose nbeeliminatedbaddingtrletbenolamine. ThismethodissimpleandfastandhaeensatisfactorilyusedforthedeterminationofFe, MandCoincemen ~ dcaide. KRYW0R ��} Residual blood ration. Cetr squirt tedearbkle. Fe Ding Shuai NickdantiCo'0ah,[link widoczny dla zalogowanych], Determination ��

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