In a long term study, which covered 4 sampling periods over three years, a total number of 84 samples, specifically 28 influent, effluent, from seven WWTP located in the main cities along the Ebro river Basin (North East of Spain), as well as receiving river waters, were analyzed to assess the occurrence of 73 pharmaceuticals covering several medicinal classes.
the occurrence of 73 pharmaceuticals covering several medicinal classes
いくつかの薬効の種類をカバーする73医薬品の発生
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いくつかの薬効の種類をカバーする73医薬品の存在
In this sentence, maybe occurrence means 存在 or 出現
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