خيارات البحث
النتائج 271 - 280 من 286
The berberine content at the parts of Phellodendron amurense Ruprecht [Rutaceae]
1979
Kubota, M. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Asakawa, K. | Matsuzawa, K.
Research of heavy metals in river sediments
1979
Takeda, Y. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Kawamura, M.
Assessment reserch of river sediments using heavy metal concentrations
1979
Katsuno, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Akaoka, T.
Investigation of harmful substances in crows and dogs
1979
Akaoka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Tsukioka, T.
Study on the wastewater treatment exhausted from the chemical laboratory, 2: The ferrite process and its actual application
1979
Seki, H. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Katsuno, T.
Field survey of photochemical oxidants damage on morning glory [Pharbitis nil] in Nagano city
1979
Komiyama, S. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Nakazawa, Y. | Hirosawa, I.
Atomic absorption spectrophotometric determination of cadmium, copper, lead in organic matter with high molecular weight amine extraction
1979
Matsuzawa, K. (Nagano-ken. Research Inst. for Health and Pollution (Japan))
As high molecular weight amine were able to extract trace cadmium, copper and lead Into an organic phase at the potassium iodide-sulfuric acid, simultaneously, conditions for determination directly organic phase with atomic absorption spectrophotometry were investigated. By setting potassium iodide concentration and sulfuric acid concentration at 0.2M and 3.6 N, respectively, cadmium, copper and lead were extracted with 5v/v% Amberlite LA-2-n-Buthyl acetate solution simultaneously. Under the conditions above described, the extraction rate of cadmium, copper were 100% and its of lead was 98%. The coefficient of variation were proved to be 0.71%, 1.47%, 1. 30%; which were obtained by the 20 repeats of determination with 1 micro g/ml cadmium, copper solution and 5 micro g/ml lead solution With regard to the effect of coexisting ions, alkaline metals, alkaline earths metals, Fe(II), Zn(II), Al(II), Mn(II), Cr(IV), Si(IV), Ni(II), As(III) etc. did not interfere. The method was applied to the determination of cadmium, copper and lead in hair with satisfactory results.
اظهر المزيد [+] اقل [-]Identifying sources of subsurface nitrate pollution with stable nitrogen isotopes
1979
Wolterink, Timothy J.
Effectiveness of soil and water conservation practices for pollution control
1979
Haith, Douglas A. | Loehr, Raymond C.
