Alkalies; Chemical preparations in the nature of ion-exchange resins; Chemical reagents, other than for medical or veterinary purposes; Chemical substances for analyses in laboratories, other than for medical or veterinary purposes; Complex salts; Inorganic acids; Radioactive elements for scientific purposes

'acid':37 'alkali':1 'analys':24 'chemic':2,12,21 'complex':34 'element':39 'exchang':10 'inorgan':36 'ion':9 'ion-exchang':8 'laboratori':26 'medic':17,30 'natur':6 'prepar':3 'purpos':20,33,42 'radioact':38 'reagent':13 'resin':11 'salt':35 'scientif':41 'substanc':22 'veterinari':19,32

A

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