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      <marc:subfield code="a">Guidelines for Canadian drinking water quality : </marc:subfield>
      <marc:subfield code="b">dimethoate and omethoate : guideline technical document.</marc:subfield>
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      <marc:subfield code="a">Guidelines for Canadian drinking water quality : </marc:subfield>
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      <marc:subfield code="a">Dimethoate and omethoate</marc:subfield>
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      <marc:subfield code="a">Ottawa, ON : </marc:subfield>
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      <marc:subfield code="c">2022.</marc:subfield>
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      <marc:subfield code="c">©2022</marc:subfield>
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      <marc:subfield code="a">"Publication date: September 2022."</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Recommandations pour la qualité de l'eau potable au Canada : diméthoate et ométhoate : document technique.</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 48-56).</marc:subfield>
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      <marc:subfield code="a">"The toxicological effects of dimethoate are the result of omethoate, its oxygen analogue metabolite (oxon). Since omethoate can be formed through the environmental degradation of dimethoate or during treatment of water containing dimethoate, an additive approach should be taken in which the sum of the detected concentrations of dimethoate and omethoate (expressed as a dimethoate equivalent value) does not exceed the maximum acceptable concentration (MAC) for dimethoate"--Page 3.</marc:subfield>
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      <marc:subfield code="t">Recommandations pour la qualité de l'eau potable au Canada : </marc:subfield>
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