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Spatial structure analysis was conducted on a previously published dataset of DDT species concentrations in topsoil samples from Tianjin, China (p,p′-DDT, p,p′-DDD, p,p′-DDE and ∑p,p′-DDTs). Positive nuggets were observed for all three DDT species and ∑p,p′-DDTs in the four directions modeled. The Nugget–Sill-Ratio values, 0.62, 0.50, 0.63 and 0.58, for p,p′-DDT, p,p′-DDE, p,p′-DDD and ∑p,p′-DDTs...
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