Based on the adsorption experiments of heavy metals onto steel slag , the effects on the adsorption of Pb2+> Cr3+ of many factors, such as the mesh of steel slag , pH, the absorbent's dosage, contact time and the initial ionic concentration were studied.
After the solution added the surfactant settled for two days, alkalinity and acidity of the solution have certain influence on the removal efficiency of Cr (VI ),when pH is 3,the removal efficiency is 99.75%,and when pH is 11,it is 97.86%.
Demonstrating the Influence of Continental Input Matteron Liaodong Bay by using Characteristic Parameters ofSediments(pH,Eh and Es) and SO_4~(2-) of Interstitial Waters
The material presented here is a synopsis of the Ph.D thesis of the author, cf.
These derivatives exhibited in vitro stability in buffers of pH 2.0 and 7.4 for 6 h and were readily hydrolyzed by human plasma esterases to liberate the parent drug.
Crossing time and renewal numbers of two PH-renewal processes
This paper considers how to find some joint distributions and their marginal distributions of crossing time and renewal numbers related to two PH-renewal processes by constructing an absorbing Markov process.
Effects of concentration, pH value, and flow rate of naringin extract on the adsorption of naringin by X-5 resin were studied.
This paper intends to describe a simple and rapid analytical method for polarographic determination of native azo dye-Variamine Blue B Salt. In 0.1 N hydrochloric acid media, the half wave of 0.001 M solution of Variamine Blue B Salt is found at a potential of -0.65 volts (vs. S.C.E.), Increasing pH and concentration of the solution causes a shift of E 1/2 to more negative potential. The height of wave rises as concentration of the solution increases but it drops as pH increases. The presence of...
This paper intends to describe a simple and rapid analytical method for polarographic determination of native azo dye-Variamine Blue B Salt. In 0.1 N hydrochloric acid media, the half wave of 0.001 M solution of Variamine Blue B Salt is found at a potential of -0.65 volts (vs. S.C.E.), Increasing pH and concentration of the solution causes a shift of E 1/2 to more negative potential. The height of wave rises as concentration of the solution increases but it drops as pH increases. The presence of sodium sulfate or zinc sulfate as deluent in the dyestuff does not affect the polarographic wave. This method is applicable for the quantitative analysis of this dyestuff.
Using acetic, sulfuric, hydrochloric, phosphoric and perchloric acid as acidifying agent, gelation time of monostlicic acid of different concentration at various pH was determined. All the log t--pH curves were of N-Shape. The pH value at the minimum point of each curve shifted upward and to- ward the left as concentration of silicic acid decreased. With acetic acid as acidifying agent, the gelation curve had the same tendency when concentra- tion of silicic acid changed, but with a strong...
Using acetic, sulfuric, hydrochloric, phosphoric and perchloric acid as acidifying agent, gelation time of monostlicic acid of different concentration at various pH was determined. All the log t--pH curves were of N-Shape. The pH value at the minimum point of each curve shifted upward and to- ward the left as concentration of silicic acid decreased. With acetic acid as acidifying agent, the gelation curve had the same tendency when concentra- tion of silicic acid changed, but with a strong acid, as hydrochloric or sulfuric, no such shift was observed at the maximum point. When log t of the minimum points of each set of gelation time curves were plotted against the corresponding log T_(?), straight lines were always obtained. However, the slope of the lines was about -3 instead of -2 as required by the theoretical equation. This is found to be due to the effect of the salt formed in the process of acidification of sodium monosilicate. When the concentration of sodium monosilicate used was kept constant and different amounts of a salt corresponding to the acid used as acidifying agent were added, the gelation curves obtained indicated that, in case when either hydrochloric acid or sulfuric acid was used as acidifying agent, the added salt had a little pro- motion effect at the maximum point but did not change the pH value. However, with the minimum points of all the curves and the maximum of that of acetic acid as acidifying agent, they all shifted downward and rightward. When log t was plotted against log T_s, straight line was also obtained, with a slope of about -1, indicating that getlation time of monosi- licic acid is inversely proportional to the first power of the concentration of salt. When the concentration of salt was kept constant and that of silicic acid varied, pH of the maximum points of all gelation curves no matter which acid was used as acidifying agent remained constant, while that of the minimum points changed but a little. And in all cases, when log t was plotted against log T_(?), a straight line was always obtained, the slope of which was -2, indicating experimental results were in complete accord with our theoretical expression. When the effect of added salt is included, the expression should be modified slightly and takes the following form: log t=log C'--(2+n')log T_A--log (1+β_1[H~+]+β_2[H~+]~2+β_3[H~+]~3)~2/β_2β_3 [H~+]~3 --log(β_1/β_2+[H~+]~2).
A new method of dearsenization polluted water by means of magnesium salts from seawater is developed-dearsenization by Magnesium Salts. This method has the advantages of high efficiency and low cast, so it suit coastal industries for their sewage disposal. The influence of arsenic content, the valency state of arsenic, magnesium salt content, the ratio between magnesium and arsenic and the nature of the medium upon dearsenization has been examined. The most favorable condition for dearsenization were....
A new method of dearsenization polluted water by means of magnesium salts from seawater is developed-dearsenization by Magnesium Salts. This method has the advantages of high efficiency and low cast, so it suit coastal industries for their sewage disposal. The influence of arsenic content, the valency state of arsenic, magnesium salt content, the ratio between magnesium and arsenic and the nature of the medium upon dearsenization has been examined. The most favorable condition for dearsenization were. found to be pH 9.5-10.5, Mg: As 8-12. Polluted water containing arsenic as high as 600 mg/l can be dearsenized with the efficiency of more than 99%. Trivalent arsenic appears to be dearsenized less easily than pentavalent arsenic. In order to decrease the amount of magnesium salt used and improve the efficiency of dearsenization, technological processes of stepwise dearsenization by magnesium saits, dearsenization by magnesium salts after the trivalent arsenic being oxidized and the removal of the residual arsenic by magnesium salts containing Fe or phosphate were studied. Conditions for dearsenizing polluted water containing about 200 mg As/l to an arsenic content conforming that of the national standard (0. 5 mg As/l) were obtained. An enlarged experiment on a 5 lsample was also made with the same satisfa- ctory resoult. Aiming at minimizing environmental pollution by way of "disposing of wastes by wastes", experiments using the waste residue discharged from soda plants-to the sea-caustic mud-to take the place of lime in dearsen- ization have also been carried out. Results prove that caustic mud not only can satisfactory take the place of lime, but also lowers the cost and increases the efficiency of dearsenization. Instead of magnesium salts from seawater, the by-product from salt- works, solid bitterm, has also been used. Satisfactory results of dearsenization have also been obtained.Thus, it is made possible for the inland plants, where sea-water is hardly avaliable, to dearsenize arsenic-containing wastewater by magnesium salts.
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