The invention discloses a bismuth oxide micropowder and its preparation method which comprises, charging bismuth nitrate solution containing 100350gl of bi 3 into ammonium hydrogen carbonate solution with concentration of 1025 wt, controlling the weight ratio of charged ammonium and bismuth between 1.53.5, producing bismuth carbonate precipitate.
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Obviously increasing in water content in the mixture will adversely affect the quality of concrete the measured slump values of quarry dust concrete with constant water cement ratio 0.55 are found to be 37, 45, 50, 54 and 60 mm for different mixes the measured compaction factor value for quarry dust concrete with constant wc ratio 0.55 are.
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Kloepper, j. w., and schroth, m. n. 1981. development of a powder formulation of rhizobacteria for inoculation of potato seed pieces. phytopathology 71 590592. a dried formulation of plant growthpromoting rhizobacteria pgpr with 20 xg after storage for 2 mo at 4 c, while populations decreased in.
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