Depuratives for water purification, heavy-metal absorbents, fluorine absorbents, and arsenic absorbents, the foregoing goods comprising a rare earth compound and used to purify polluted water and soil by absorbing impurities such as arsenic, lead, fluorine, chromium, selenium and boron

'absorb':8,10,13,31 'arsenic':12,35 'boron':41 'chromium':38 'compound':21 'compris':17 'depur':1 'earth':20 'fluorin':9,37 'forego':15 'good':16 'heavi':6 'heavy-met':5 'impur':32 'lead':36 'metal':7 'pollut':26 'purif':4 'purifi':25 'rare':19 'selenium':39 'soil':29 'use':23 'water':3,27

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