AbstractThe extent of the risk of (Z)‐ and (E)‐1,3‐dichloropropene and their transformation products (Z)‐ and (E)‐3‐chloroallyl alcohol causing a hazard to the quality of groundwater pumped up for public water supply from below flower‐bulb fields has been evaluated. The 1,3‐dichloropropenes were incubated at 10°C in water‐saturated subsoil material from three such fields. A first stage with gradual transformation was followed by a second stage with comparatively rapid transformation and after three months negligible amounts remained. The 3‐chloroallyl alcohols were incubated at 15°C in soils from the root zone of the same fields. Complete transformation had occurred in about a week or even less. The 3‐chloroallyl alcohols were also incubated in the water‐saturated subsoil material at 10°C. Again, a first stage with gradual transformation was followed by a second stage with fast transformation. In most instances, the concentrations had fallen to a very low level within three months. It was concluded that it is unlikely that residues in the upper groundwater would permeate into the deeper groundwater pumped
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