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ChromVI Al-L • Detection <br /> • KMn04 X Non-Detect <br /> 1e6 <br /> 1.4 / <br /> 1.2 0 1 <br /> 1.0 <br /> 0 0.8 <br /> u 0, 0 <br /> 0,4 � � 1 <br /> f 1 � <br /> 0. 2 I <br /> 2016.5 2017.0 2017 . 5 2018 .0 2018 , 5 2019 ,0 2019.5 2020,0 2020. 5 <br /> Year <br />