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The Experts below are selected from a list of 2043 Experts worldwide ranked by ideXlab platform
Daniel J Williams – 1st expert on this subject based on the ideXlab platform
Aluminium Sulfate and sodium aluminate buffer solutions for the destruction of phosphorus based chemical warfare agentsNew Journal of Chemistry, 2009Co-Authors: Daniel J Williams, William R Creasy, David Mcgarvey, Vicky L H Bevilacqua, Dupont H DurstAbstract:
Nerve agents VX and GB (sarin) are sequestered and removed by Aluminium Sulfate and sodium aluminate mixtures adjusted to pH 4 in solution. The products of hydrolysis are removed with the alum floc below NMR detection limits over time depending and the amount of Aluminium molar excess relative to agent. Half-lives for GB decomposition are 3.1 h and 1.1 h, respectively, for a 120 and a 1200 molar excess. For VX, the half-lives are 8.5 d and 2.9 d for a 240 and a 5000 molar Aluminium excess. In the case of GB, fluorine is sequestered as the hexafluoroaluminate ion. In the case of VX, no phosphorus containing hydrolysis products including the very toxic S-[2-(diisopropyl-amino)-ethyl]methylphosphonothiolate (EA-2192) are detected in the hydrolysate.
Yuquan Xu – 2nd expert on this subject based on the ideXlab platform
removal of humic substances from soil dna using Aluminium SulfateJournal of Microbiological Methods, 2006Co-Authors: Dexian Dong, Xuehong Zhang, Yuquan XuAbstract:
Abstract Direct extraction of soil DNA has become essential for the study of soil microorganisms. Humic substances co-extracted during DNA retrieval is a big problem because it greatly inhibits the enzymes involved in manipulating DNA. Popular commercial kits available for soil DNA extraction are unable to overcome this problem. Here we report an effective protocol for the removal of humic substance from soil DNA. The protocol involves flocculation of the humic substance by excessive Al 3+ , then removal of superfluous Al 3+ via pH adjustment and finally release of soil microbial DNA by SDS lysis. This technique is superior to that employed by the UltraClean Soil DNA Kit and can be applied to a wide variety of soils.
P K Mitra – 3rd expert on this subject based on the ideXlab platform
thermal decomposition of precipitated low bulk density basic Aluminium SulfateMaterials Chemistry and Physics, 2004Co-Authors: I N Bhattacharya, P K Gochhayat, P S Mukherjee, S Paul, P K MitraAbstract:
Abstract Hydrated basic Aluminium Sulfates (BAS) are of great importance as precursor material for the preparation of activated and high pure calcined aluminas. Low bulk density category BAS powders have superior quality over higher bulk density varieties in terms of higher surface area, more active sites for adsorption, etc. A brief description on the processing route of low bulk density BAS powders utilizing Aluminium Sulfate and ammonia as hydrolyzing precipitant has been presented. Low Al 3+ concentration and pH of around 7–7.2 were found to be crucial for formation of such material. Characterization of this low bulk density material and its different calcined products was also carried out. The characterization was performed through XRD, FTIR and DTA studies. The XRD analysis indicated precipitated powder to be an amorphous material. Interestingly, this amorphous structure is retained till 800 °C. At 900 °C, η-Al 2 O 3 phase appears to be the only transitional phase during its transformation to α-Al 2 O 3 at 1100–1200 °C. FTIR study showed characteristic vibration modes related to molecular water, co-ordinated Sulfate and AlO bonds.