Biomethylation of Arsenic in Contaminated Soils - Environmental Contamination: Health Risks and Ecological Restoration - page 242

TABLE 12.1 (continued)
Summary.of.Arsenic.Biomethylation.Rates.under.Different.Methylating.Conditions.from.Various.Studies

Methylation
Products
Measured

Arsenic
Source

Extentof
Biomethylation a

Incubation
Method

Environmental
Conditions

Incubation
Time Microorganisms Substrate References

30.mg/L.
Na 2 HAsO 4 ,.
newly.spiked

35 Inoculated.

methanogenic.
bacteria

Anaerobic,.
35°C,.pH.7

Cow.dung.
and.
glucose

40.days Volatilized.

As.gas

Mohapatra.
et.al..
(2008)

CCA.
contaminated.
soils

0-0.17.
mg/kg.
soil

Bacteria Aerobic,.room.

temperature,.
pH.7,.
darkness

Glucose 5.days MMAA,.

DMAA

Turpeinen.
et.al..
(1999)

CCA.
contaminated.
soils

0 Bacteria Anaerobic,.

room.
temperature,.
pH.7,.
darkness

Glucose 5.days MMAA,.

DMAA

Turpeinen.
et.al..
(1999)

100.μg.
DSMA/g.
soil,.newly.
spiked

2.2-11 No.inoculation Soil pH.6.6,.wet.

and.moist.
condition

Ground.
corn.
seedlings

60.days Total.arsenic.

loss.in.soil

Atkins.and.
Lewis.
(1976)

a. Based.on.total.volatile.methylated.arsenic.detected.over.whole.incubation.period,.unless.otherwise.speciied.
MMAA,. monomethylarsonic. acid;. DMA,. dimethylarsine;. TMA,. dimethylarsine;. MSMA,. monosodium. methane-arsonate;. CA,. cacodylic. acid;. MMA,.
monomethylarsine;.CCA,.chromated-copper.arsenate;.DMAA,.dimethylarsinic.acid;.DSMA,.disodium.methane-arsonate.