Question: A sludge sample was collected after sludge was dewatered from a belt-dewatering equipment, the moisture content was 15%. This sludge sample was further air-dried and

A sludge sample was collected after sludge was dewatered from a belt-dewatering equipment, the moisture content was 15%. This sludge sample was further air-dried and measured for its copper content at 100 mg/kg (dry basis). The copper concentration on a wet basis is ___ mg/kg.

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