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In 12 of the 44 gardens, levels of contaminants were below guidance values in all soil samples tested, reports Murray McBride, director of the Cornell Waste Management Institute, professor of crop and soil sciences, and principal investigator.
Before starting measurements, we carefully cleaned the CLOUD chamber (see Methods) and established extremely low contaminant concentrations: at 38% relative humidity and 278 K, the contaminants were below the detection limit for SO2 (<15 p.p.t.v). and H2SO4 (<5 × 104 cm−3), and total organics (largely comprising high volatility C1 C3 compounds) were below 150 p.p.t.v.
All contaminants were below the detection limits: 0.05 mg 2,3,7,8-tetrabromodibenzo 2,3,7,8-tetrabromodibenzo5 mg octabromodibenzo- p-dioxin/kg PBDE-99.
A sample of Sera Micron was analysed by Lancaster Laboratories (Lancaster, PA, USA) for potential contaminants (metals and pesticides), and all tested contaminants were below their limits of quantification for analysis at that facility.
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But keep in mind that certification does not mean a water is free of contaminants, merely that the level of contamination is below certain allowable limits.
Although the lead and other heavy metal contaminants were well below action levels, says Darden, the foundation made a policy of doubling the recommended depth of added clean soil "to be on the safe side".
Most of the contaminants were found in levels below federal drinking water standards, but benzene exceeded the standard in 5 of 25 wells, the ethyl benzene in 3 of the wells, and arsenic in 1.
All residue contaminants were detected at levels well below their acceptable MRLs except malathion suggesting that the retail honey analyzed is safe for human consumption.
The main radionuclidic contaminants were I (<0.5%) and I (<0.03%); other radionuclidic impurities, if any, were below detection limit.
The contaminants were detected in raw groundwater, prior to purification.
Ribosomal proteins (common contaminants) were also excluded.
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