The influence of hydrochloric acid concentration and measurement method on the determination of amino acid levels in soya bean products

Palladium may be precipitated quantitatively with 1,10-phenanthroline from palladous chloride solutions; variations in the hydrochloric acid concentration from 1 to 20% had no effect on the precipitation. The reagent yields no precipitates with other platinum metals under similar conditions; slightly high results, however, were obtained when palladium was precipitated from solutions containing these metals. The precipitate has the composition C12H8N2PdCl2 and may be used as a weighing form for palladium. A micro-volumetric method for palladium using 1,10-phenanthroline is described. Small amounts of platinum (as Pt+4) do not interfere.

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Determination of Ni(II) in Water Using Nanometer Attapulgite Adsorption via FAAS

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.599.96 ◽

2012 ◽

Vol 599 ◽

pp. 96-99

Author(s):

Yan Min Hou ◽

Xiao Jun Zhao ◽

Ji Min Xie

Keyword(s):

Detection Limit ◽

Hydrochloric Acid ◽

Acid Concentration ◽

Environmental Water ◽

Regression Equation ◽

Experimental Results ◽

Hydrochloric Acid Concentration ◽

Elution Volume ◽

Adsorbent Dosage

nanometer attapulgite is a fine adsorptive reagent to Ni(II) in specific pH,adsorbent dosage , surging and depositing time, hydrochloric acid concentration, elution volume , surging and depositing time for the recovery and static adsorptive capability. The experimental results show that Zn(II)、Co(II)、K+、Cu(II)、Na+、Mn(II)、Pb(II)、Hg(II) 、SiO32- 、WO42- 、MoO42- 、HPO42-、VO3- didn’t interfere the adsorption to Ni(Ⅱ). the linear range is 0.10~1.5ug/mL, the regression equation is A=0.0476C+0.0084 r=0.9996 .the detection limit is 0.190μg/mL for Ni(II),recovery is 86.7.5%-102.5%. This method can be used to the determination of Ni(II) in environmental water.

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DETERMINATION OF SERUM AMINO ACID CONCENTRATION IN FREE-RANGING AND CAPTIVE YANGTZE FINLESS PORPOISE(NEOPHOCAENA PHOCAENOIDES ASIAEORIENTALIS)

Acta Hydrobiologica Sinica ◽

10.3724/sp.j.1035.2008.00244 ◽

2008 ◽

Vol 32 (2) ◽

pp. 244-251

Author(s):

Gang LIN

Keyword(s):

Amino Acid ◽

Acid Concentration ◽

Amino Acid Concentration ◽

Finless Porpoise ◽

Yangtze Finless Porpoise ◽

Neophocaena Phocaenoides ◽

Neophocaena Phocaenoides Asiaeorientalis ◽

Free Ranging

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Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.1033 ◽

2013 ◽

Vol 734-737 ◽

pp. 1033-1036

Author(s):

Gui Fang Zhang ◽

Peng Yan ◽

Qing Rong Yang

Keyword(s):

Experimental Study ◽

Particle Size ◽

Hydrochloric Acid ◽

Acid Concentration ◽

Hydrochloric Acid Concentration ◽

Leaching Rate ◽

Optimal Conditions ◽

Research Results ◽

Solid Ratio ◽

Leaching Residue

Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium entering into solution. The research results has shown that the scandium leaching rate could reach 92.06% under the optimal conditions which the hydrochloric acid concentration is 22.8%, the dosage of aid leaching agent is 6%, liquid solid ratio is 4:1, particle size of leaching material totally is less than 0.15mm and leaching time is 8h.

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