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Daniel Moore Mathew Taylor

NATURAL BACKGROUND TOPSOIL ARSENIC CONCENTRATIONS AND SOME IMPLICATIONS FOR APPLYING SGVs (HEALTH). Daniel Moore Mathew Taylor Ministry for the Environment Environment Waikato. Introduction. Acknowledgements

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Daniel Moore Mathew Taylor

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  1. NATURAL BACKGROUND TOPSOIL ARSENIC CONCENTRATIONS AND SOME IMPLICATIONS FOR APPLYING SGVs(HEALTH) Daniel Moore Mathew Taylor Ministry for the Environment Environment Waikato

  2. Introduction • Acknowledgements • Policy : toxicological vs. natural • Limited published arsenic data • Regional council data request

  3. Timber Treatment Guidelines 1997 “The nominated criterion should not be less than a reasonable background concentration of arsenic. In this regard a value of, say, 30 mg/kg may be appropriate (Spier, 1997) notes that typically background concentrations of arsenic in New Zealand soils range from 2 to 30 mg/kg)”

  4. Arsenic dataset • Collate existing data • Sample density, variability, confidence • Identification of data limitations • Assess key drivers of landscape-scale variation

  5. Regional data summary

  6. Data analysis • Data quality • Standardised land use • Standardised soil type • Data desk • Pooled t-test

  7. Data limitations • Variation in the sampling and analysis methodology • Poor land use classification • Representative Background data • Variation due to soil type • The effect of soil bulk density

  8. Conclusions • Bush, indigenous forest, native = background • National As average 6.0 mg/kg • Background As average 4.5 mg/kg • Cropping, horticulture and urban land uses higher concentrations than background. • Waikato region statistical significance

  9. Upcoming • Cadmium • Publish SGV comparisons • Data email: daniel.moore@mfe.govt.nz • Questions?

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