Effects of trace elements on arylsulfatase activity in soils. [Effects of heavy metal and trace element pollutants]

Journal Article · Thu Mar 01 00:00:00 EST 1979 · Soil Sci.; (United States)

OSTI ID:6368821

Al-Khafaji, A A; Tabatabai, M A

Studies to evaluate the effects on arylsulfatase activity of 21 trace elements showed that all elements inhibited the activity of this enzyme in soils. Results showed that the relative effectiveness of trace elements in inhibition of arylsulfatase activity depends on the soil. When the trace elements were compared by using 25 ..mu..mole/g soil, the average inhibition of arylsulfatase in the four soils studied showed that Ag(I), Hg(II), B(III), V(IV), and Mo(VI) were the most effective inhibitors (average inhibition >50 percent) and that Fe(II) was the least effective (average inhibition <10 percent). Other trace elements that inhibited arylsulfatase in soils were: Cu(I), Cd(II), Sn(II), Zn(II), Cu(II), Ba(II), Mn(II), Ni(II), Pb(II), Co(II), Cr(III), Al(III), Fe(III), As(III), Se(IV), Ti(IV), As(V), and W(VI). Among these elements, Cu(II) and Fe(III) were more effective than Cu(I) and Fe(II), respectively. But As(V) was somewhat less effective than As(III). Generally, the inhibitory effect of the trace elements studied decreased when the amount of trace element added per gram of soil decreased by 10-fold (from 25 ..mu..moles to 2.5 ..mu..moles). The inhibition by MoO/sub 4//sup 2 -/, WO/sub 4//sup 2 -/, AsO/sub 4//sup 3 -/, and PO/sub 4//sup 3 -/ showed competitive kinetics. Related anions, such as NO/sub 2//sup -/, NO/sub 3//sup -/, Cl/sup -/, SO/sub 4//sup 2 -/, did not inhibit arylsulfatase activity in soils.

• Research Organization: Iowa State Univ., Ames
• OSTI ID: 6368821
• Journal Information: Soil Sci.; (United States), Vol. 127:3
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
54 ENVIRONMENTAL SCIENCES
ELEMENTS
BIOLOGICAL EFFECTS
ENZYME ACTIVITY
INHIBITION
HYDROLASES
METALS
SOILS
POLLUTION
ALUMINIUM
ARSENIC
BARIUM
BIOCHEMICAL REACTION KINETICS
BROMINE
CADMIUM
CHROMIUM
COBALT
COPPER
EXPERIMENTAL DATA
IRON
ISOLATED VALUES
LEAD
MANGANESE
MERCURY
MOLYBDENUM
NICKEL
SELENIUM
SILVER
TIN
TITANIUM
TRACE AMOUNTS
TUNGSTEN
VANADIUM
ZINC
ALKALINE EARTH METALS
DATA
DATA FORMS
ENZYMES
HALOGENS
INFORMATION
KINETICS
NONMETALS
NUMERICAL DATA
REACTION KINETICS
REFRACTORY METALS
SEMIMETALS
TRANSITION ELEMENTS
560300* - Chemicals Metabolism &amp; Toxicology
510200 - Environment
Terrestrial- Chemicals Monitoring &amp; Transport- (-1989)