Lub Tebchaws Kev Nyab Xeeb Kev Nyab Xeeb Kev Nyab Xeeb rau Kev Haus Dej Ntuj Dej (GB 8537-2018) qhia txog xya qhov kev txwv rau cov dej ntxhia hauv ntuj, suav nrog lithium, strontium, zinc, metasilicic acid, selenium, dawb carbon dioxide, thiab tag nrho cov yaj yaj. Kev haus dej ntxhia hauv ntuj yuav tsum ua kom tau raws li qhov yuav tsum tau ua rau ib lossis ntau dua ntawm cov ntsuas no.
Thaum xaiv haus cov dej ntxhia ntuj, peb kuj yuav tsum tau ua tib zoo saib rau daim ntawv lo. Ntxiv rau qhov qhia txog lub npe khoom, cov npe khoom, cov ntsiab lus thiab cov lus qhia tshwj xeeb, lub npe, chaw nyob thiab cov ntaub ntawv tiv tauj ntawm tus tsim khoom thiab / lossis tus neeg xa khoom, hnub tsim khoom thiab lub neej txee, cov xwm txheej khaws cia, tus naj npawb daim ntawv tso cai tsim khoom noj, thiab cov khoom lag luam tus qauv, daim ntawv lo rau cov dej ntxhia ntuj yuav tsum qhia cov hauv qab no:
1. Qhov chaw ntawm cov dej ntxhia ntuj;
2. Txwv cov cim qhia txog kev ua raws li cov khoom lag luam thiab tag nrho cov khoom tawg;
3. Cov ntsiab lus ntawm cov cations loj (K+, Na+, Ca2+, Mg2+);
4. Thaum cov ntsiab lus fluoride ntau dua 1.0 mg/L, nws yuav tsum tau sau tias "muaj fluoride".
