Before they were playgrounds, many of those schoolyards were orchards and Redfield-Wilder said the lead arsenate
once used for pesticides are especially harmful to children--which is why they have since been cleaned.
Exposed[n(%)] OR (95% CI) Arsenic (a) Cases Noncases Crude Adjusted (b) Lead arsenate crop insecticide Never used 140(93.3) 23,733(96.7) Ever Used 10(6.7) 821(3.3) 2.1(1.1-3.9) 1.2(0.6-2.3) Any arsenic pesticide (c) Never used 139(92.7) 23,680(96.4) Ever used 11(7.3) 874(3.6) 2.2(1.2-4.1) 1.3(0.7-2.4) (a) Based on answers to the question "What other pesticides have you used frequently (either now or in the past)?" on the take-home questionnaire.
Interactions of lead arsenate and specific pesticides on risk of cutaneous melanoma among pesticide applicators completing the take -home questionnaire in the Agricultural Health Study.
Study on the carcinogenicity of lead arsenate
and sodium arsenate and on the possible synergistic effect of diethylnitrosamine.
Sediment cores collected from the open water area of Sky Lake contained elevated Pb and As concentrations in layers deposited in the 1920s when lead arsenate pesticide was widely used on cotton fields.
The slight offset in time between the Pb and As peaks may be due to differences in post-depositional mobility of Pb and As or variable usage of calcium and lead arsenates. Additional peaks and elevated As concentrations following 1930 without corresponding Pb peaks may be attributed to the brief history of Pb use but continued incorporation of As in newer pesticides.
Our study seeks to complement these existing studies by analyzing both arsenic and lead (to assess impact of arsenic-based pesticide as well as lead arsenate
in particular) and doing so using U.S.
(2003) reported on elevated levels of arsenic in and around homes constructed on or near fruit orchards in agricultural communities with historical use of lead arsenate
. This study showed strong correlations between indoor and outdoor concentrations of arsenic and hence provided evidence for a "track-in" exposure pathway for residential environments.
In the 1950s, when lead arsenate
pesticides were used heavily on tobacco farms, arsenic concentrations were recorded as high as 1.4[mu]g per cigarette.
Once LA reached the soil through over-spray, spillage, rainfall wash-off, or simply fallen fruit and leaves, the lead arsenate
underwent hydrolysis, separating into lead and arsenic bound to organic particles in the soil.
More recent mining of the oxide zones at the Girilambone, New Cobar and Elura (Endeavor) deposits has exposed a rich diversity of secondary minerals including copper carbonates and phosphates, copper and lead arsenates
, and silver minerals.