I roto i te hanga me te oranga, ka taea te whakamahi i te silica gel ki te whakamaroke i te N2, te hau, te hauwai, te hau maori [1] me etahi atu.E ai ki te waikawa me te kawakore, ka taea te wehea te whakamaroke ki: te whakamaroke waikawa, te whakamaroke kawakore me te whakamaroke koretake [2].Ko te kirika silica te ahua he whakamaroke koretake e ahua maroke ana te NH3, HCl, SO2, ...
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