Promazine hydrochloride (PMH) reacts in acidic medium with K2Cr2O7 forming coloured oxidation product. This property is exploited for using PMH as redox indicator in chromatometry. The spectra of oxidation products of PMH in UV and IR regions were recorded. The optimal conditions for the formation...
Determination of Nitric Oxide (NO): The principle was the formation of nitrous acid diazotise sulphanilamide in the presence of nitrite and in an acidic medium.N-(1-naphthyl)-ethylenediamine was coupled to the product. A bright reddish-purple colour appeared to the resulting azo dye that was...
K2Cr2O7 in acidic solution, has strong oxidation ability, less corrosion of the glass instrument ps.. So this lotion is most widely used in the laboratory. The concentration varies from 5~12% to various concentrations. Roughly the same preparation method: take a certain amount of K2Cr2O7 (...
For metals treat- ments, FeSO4 (7 mM), CdCl2 (0.5 mM), K2Cr2O7 (1 mM), and NiCl2 (1 mM) were prepared from stock solu- tions and applied into fresh nutrient solution and as [24] with exception of phosphorus (P) that prevents precipi- tation of lead (Pb) [25]. The whole ...
Arsenous acid with pK1 % 9.2 is fully protonated under normal natural water pH, whereas arsenic acid with pK1 % 2.3 requires highly acidic conditions i.e. pH < 1. Thus, utilizing the pH dependency of hydride generation and reduction kinetics, various methods have been reported for the ...
It is a typical acidic soil in southern China with low soil pH (4.6), cation exchange capacity (8.5 cmol kgÀ1), and organic matter (OM) content (0.66%). The XRD results indicate that the mineralogy of the red soil is dominated by clay minerals (e.g., kaolinite, montmorillonite, ...
advancesinresearchonsolventmediumforliquid-phasepartialoxidation 系统标签: 甲烷溶剂methane甲醇氧化介质 CHEMICALINDUSTRYANDENGINEERINGPROGRESS2014年第33卷第10期·2598·化工进展甲烷液相部分氧化制甲醇中溶剂介质的研究进展肖勇山,陆润侠,唐呈前,晁伟辉,陈立宇(西北大学化工学院,陕西西安710069)摘要:甲烷液相转化具有反应条...
it decreases. This behaviour was associated to the protonation that takes place when the soil is acidic, resulting in an increase in the interaction between soil matrix and the phenolic compound. Phenol and phthalate sorption in soil therefore show opposite patterns under acidic pH. Whereas high ac...
Oxidation of atropine (ATN) by K2Cr2O7 has been studied kinetieally in aqueous strongly acidic solutions. The kinetics of this reaction was investigated at different temperatures. A constant pH and constant ionic strength were maintained constant throughout all measurements. The concentration of ...
[3] by H2O2 in the presence of substituted PcFe's permit to avoid using of environmentally harmful oxidants such as PbO2, KMnO4, K2Cr2O7 be utilized previously. Substituted PcFe's catalyze selectively phenol and chlorophenols oxidation with PcFe - H2O2 in acidic medium to polymeric compounds, ...