extracting and filtering units used to remove chlorinated hydrocarbon pesticides, polychlorinated biphenyls and polynuclear aromatic hydrocarbons from liquids and gases, and for anion and cation exchange, for use in the preparative biotechnology, and pollution control and monitoring industries

'anion':23 'aromat':15 'biotechnolog':32 'biphenyl':12 'cation':25 'chlorin':8 'control':35 'exchang':26 'extract':1 'filter':3 'gase':20 'hydrocarbon':9,16 'industri':38 'liquid':18 'monitor':37 'pesticid':10 'pollut':34 'polychlorin':11 'polynuclear':14 'prepar':31 'remov':7 'unit':4 'use':5,28

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