Factors affecting molybdenum adsorption by soils and minerals

被引:100
作者
Goldberg, S [1 ]
Forster, HS [1 ]
机构
[1] USDA ARS, US Salin Lab, Riverside, CA 92507 USA
关键词
aluminum oxide; iron oxide; kaolinite; montmorillonite; illite; soils;
D O I
10.1097/00010694-199802000-00004
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Molybdenum adsorption behavior was investigated an a variety of crystalline and X-ray amorphous aluminum and iron oxide minerals, clay minerals, and arid-zone soils as a function of solution pH, molybdenum concentration, ionic strength, particle concentration, competing anion concentrations, and temperature. All of these factors influenced the extent of the Mo adsorption reaction. Adsorption on all materials showed pronounced pH dependence in the pH range 3 to 10.5. Maximum adsorption occurred at low pH and then decreased rapidly with increasing pH until adsorption was virtually zero near pH 8. Adsorption as a function of pH was studied at two initial molybdenum concentrations. Adsorption on a percentage basis was greater for the smaller Mo concentration. Adsorption as a function of pH tvas studied at two particle concentrations. At the larger particle concentration, adsorption reached 100% over most of the pH range. At the smaller particle concentration, 100% adsorption did not occur, allowing better definition of the shape of the adsorption envelopes. The effect of ionic strength was studied in background electrolyte concentrations of 0.01, 0.1, and 1.0 M NaCl. On all materials, Mo adsorption was smallest for the largest solution ionic strength. The adsorbents exhibited diverse behavior in ionic strength dependence. Molybdenum adsorption was investigated as a function of temperature at 10, 25, and 40 degrees C and was found to be endothermic, increasing with increasing temperature. In competitive systems containing arsenate or phosphate in concentrations equimolar or twice equimolar to molybdate, Mo adsorption was affected very little by the presence of the competing ion. Molybdenum adsorption on a variety of adsorbents showed dependence on solution Mo concentration and solution pH. Adsorption was affected little by other factors, including particle concentration, solution ionic strength, temperature, and competing ion concentration. These results will facilitate the incorporation of Mo adsorption reactions into chemical speciation and transport codes because only a few factors affecting Mo adsorption will have to be considered.
引用
收藏
页码:109 / 114
页数:6
相关论文
共 34 条
[1]   COMPARISON OF ADSORPTION OF MOLYBDATE, SULFATE AND PHOSPHATE BY SOILS [J].
BARROW, NJ .
SOIL SCIENCE, 1970, 109 (05) :282-+
[2]   MOLYBDENUM ADSORPTION BY ALUMINUM AND IRON-OXIDES AND HUMIC-ACID [J].
BIBAK, A ;
BORGGARD, OK .
SOIL SCIENCE, 1994, 158 (05) :323-328
[3]  
CARPENI G, 1947, B SOC CHIM FR, V14, P501
[4]   SIMPLIFIED ETHYLENE-GLYCOL MONOETHYL ETHER PROCEDURE FOR ASSESSMENT OF SOIL SURFACE-AREA [J].
CIHACEK, LJ ;
BREMNER, JM .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1979, 43 (04) :821-822
[5]   EFFECTS OF NONREVERSIBILITY, PARTICLE CONCENTRATION, AND IONIC-STRENGTH ON HEAVY-METAL SORPTION [J].
DITORO, DM ;
MAHONY, JD ;
KIRCHGRABER, PR ;
OBYRNE, AL ;
PASQUALE, LR ;
PICCIRILLI, DC .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1986, 20 (01) :55-61
[6]   MOLYBDATE SORPTION BY OXIDES OF ALUMINUM AND IRON [J].
FERREIRO, EA ;
HELMY, AK ;
DEBUSSETTI, SG .
ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE, 1985, 148 (05) :559-566
[7]   Molybdenum adsorption on oxides, clay minerals, and soils [J].
Goldberg, S ;
Forster, HS ;
Godfrey, CL .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1996, 60 (02) :425-432
[8]  
GOLDBERG S, 1997, IN PRESS AM CHEM SOC
[9]   MOLYBDATE ADSORPTION CHARACTERISTICS OF VOLCANIC-ASH-DERIVED SOILS IN CHILE [J].
GONZALEZ, R ;
APPELT, H ;
SCHALSCHA, EB ;
BINGHAM, FT .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1974, 38 (06) :903-906
[10]  
HAYES KF, 1996, PHYSICS C HEM MINERA