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Lake sediment - Trace elementsCertified valuesAs............................. 33.4 mg/kg Cr ............................... 126 mg/kg Ni ................................ 69 mg/kgCd ............................ 0.85 mg/kg Cu ................................ 53 mg/kg Zn .............................. 224 mg/kgCo ............................ 16.8 mg/kg Hg ............................. 1.46 mg/kg