Effect of silver on the ferrous iron oxidizing ability of Thiobacillus ferrooxidans

被引:18
作者
De, GC
Oliver, DJ
Pesic, BM
机构
[1] UNIV IDAHO,DEPT MIN & MET ENGN,MOSCOW,ID 83843
[2] UNIV IDAHO,DEPT BACTERIOL & BIOCHEM,MOSCOW,ID 83843
关键词
D O I
10.1016/0304-386X(95)00057-N
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The effect of silver on the iron oxidizing ability of Thiobacillus ferrooxidans was studied using electrochemical and other physicochemical techniques, Electrochemical investigation was conducted using a method based on change in redox potential, The rate of ferrous ion oxidation is influenced by pH (optimum pH range is 1.7-2.0), microbial cell concentration, and Fe(II) concentration. The mechanism of the bacterially mediated oxidation of ferrous iron is found to be influenced by temperature changes, In the vicinity of the optimum temperature (25 degrees C), the reaction is likely to be controlled by the diffusion of Fe(II) ions, whereas below the temperature range 18-25 degrees C, chemical reaction may be the rate-controlling factor. Ag(I) is detrimental to the microbial oxidation of Fe(II). In the presence of 10 mg/l silver, the reaction may be chemically controlled over the temperature range 5.5-25 degrees C, Inhibition of microbial Fe(II) oxidation in the presence of silver may take place via a mixed mechanism in which silver may bind with both the iron oxidizing enzyme(s) and the enzyme-Fe(II) complex.
引用
收藏
页码:211 / 229
页数:19
相关论文
共 44 条
[1]   CATALYTIC EFFECTS OF SILVER IN THE MICROBIOLOGICAL LEACHING OF FINELY GROUND CHALCOPYRITE-CONTAINING ORE MATERIALS IN SHAKE FLASKS [J].
AHONEN, L ;
TUOVINEN, OH .
HYDROMETALLURGY, 1990, 24 (02) :219-236
[2]  
Ballester A, 1987, SEPARATION PROCESSES, P99
[3]  
Bartlett R.W., 1990, MINING METALLURGY EX, V7, P22, DOI [10.1007/BF03403277, DOI 10.1007/BF03403277]
[4]  
BARTLETT RW, 1992, SOLUTION MINING, P113
[5]   RESPIRATORY COMPONENTS IN ACIDOPHILIC BACTERIA THAT RESPIRE ON IRON [J].
BLAKE, R ;
SHUTE, EA ;
WASKOVSKY, J ;
HARRISON, AP .
GEOMICROBIOLOGY JOURNAL, 1992, 10 (3-4) :173-192
[6]  
BLAKE RC, 1988, BIOHYDROMETALLURGY, P103
[7]   GROWTH-KINETICS OF THIOBACILLUS-FERROOXIDANS ISOLATED FROM ARSENIC MINE DRAINAGE [J].
BRADDOCK, JF ;
LUONG, HV ;
BROWN, EJ .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1984, 48 (01) :48-55
[8]   BIOACCUMULATION OF SILVER BY A MULTISPECIES COMMUNITY OF BACTERIA [J].
CHARLEY, RC ;
BULL, AT .
ARCHIVES OF MICROBIOLOGY, 1979, 123 (03) :239-244
[9]   PRETREATMENT OF CHALCOPYRITE ORE WITH ALKALI - A SIMPLE TECHNIQUE TO IMPROVE THE LEACHING MEDIATED BY THIOBACILLUS-FERROOXIDANS [J].
DATTA, TK ;
GHOSH, N ;
SEN, R ;
DASGUPTA, AK .
MINERALS ENGINEERING, 1990, 3 (06) :641-644
[10]  
DE GC, 1993, P INT BIOH S WYOM US, P545