Sodium Fluosilicate hauv Dej Fluoridation: Mechanism & Industry Standards

Sodium fluosilicate (Na₂SiF₆), tseem hu ua sodium silicofluoride, yog ib qho tseem ceeb siv nyob rau hauv cov dej fluoridation hauv nroog, ib qho kev ntsuas kev noj qab haus huv rau pej xeem tsim los txo cov hniav lwj. Raws li cov hmoov dawb, tsis muaj ntxhiab tsw crystalline, nws yaj hauv dej kom tso cov fluoride ions, uas ntxiv dag zog rau cov hniav enamel thiab tiv thaiv kab noj hniav. Rau cov neeg siv khoom lag luam thiab cov chaw kho dej, kev nkag siab txog nws cov txheej txheem ntawm kev nqis tes ua thiab cov qauv kev lag luam yog qhov tseem ceeb los ua kom cov dej fluoridation ua tau zoo thiab ua raws.

 

Cov txheej txheem ntawm sodium fluorosilicate hauv dej fluoridation yog ncaj nraim. Thaum yaj hauv dej ntawm nruab nrab pH, sodium fluorosilicate dissociates kiag li, tsim cov fluoride ions (F⁻), sodium ions (Na⁺), thiab silicic acid (Si (OH) ₄). Cov tshuaj fluoride ions yog cov khoom siv, vim lawv khi rau cov hniav enamel, tsim cov txheej txheem ntau dua uas tsis tshua muaj kev cuam tshuam rau cov kua qaub los ntawm cov khoom noj thiab dej haus. Cov txheej txheem no tau ua pov thawj los txo cov hniav lwj los ntawm 20-40% hauv cov zej zog uas muaj cov dej fluoridated, ua sodium fluosilicate ib qho cuab yeej tseem ceeb rau kev noj qab haus huv rau pej xeem.

 

Cov qauv kev lag luam rau sodium fluosilicate hauv dej fluoridation yog nruj, vim lawv cuam tshuam ncaj qha rau pej xeem kev nyab xeeb. Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv Ntiaj Teb (WHO) pom zoo kom muaj fluoride concentration ntawm 0.5–1.5 mg / L hauv cov dej haus, nyob ntawm thaj chaw huab cua (qhov siab dua hauv cov huab cua txias, qis dua hauv cov huab cua sov uas siv dej ntau dua). Sodium fluosilicate siv rau cov dej fluoridation yuav tsum muaj qhov tsawg kawg nkaus purity ntawm 98%, nrog rau kev txwv nruj ntawm cov hlau hnyav (lead Less tshaj los yog sib npaug rau 5 ppm, arsenic Tsawg dua lossis sib npaug li 2 ppm) thiab lwm yam impurities uas tuaj yeem paug cov dej haus.

 

Ntxiv rau cov qauv purity, sodium fluosilicate yuav tsum ua raws li cov cai hauv cheeb tsam. Piv txwv li, US Environmental Protection Agency (EPA) muab cov tshuaj sodium fluosilicate ua cov tshuaj kho dej nyab xeeb, nrog rau cov lus qhia tshwj xeeb rau kev siv tshuaj thiab kev siv. Hauv European Union, nws yuav tsum ua raws li Cov Lus Qhia Txog Dej Haus (98/83 / EC), uas tau txwv tsis pub muaj cov tshuaj fluoride thiab cov ntsiab lus tsis huv. Cov qauv no xyuas kom meej tias sodium fluorosilicate muaj kev nyab xeeb rau tib neeg noj thiab siv tau zoo rau nws txoj kev siv.

 

Rau cov chaw kho dej thiab cov chaw xa tawm, xaiv cov khoom zoo - zoosodium fluorosilicate iavyog qhov tseem ceeb. Nws yog ib qho tseem ceeb rau qhov chaw los ntawm cov neeg muag khoom uas tuaj yeem muab Daim Ntawv Pov Thawj Kev Ntsuam Xyuas (CoA) txheeb xyuas qhov tseeb, qib impurity, thiab ua raws li cov qauv thoob ntiaj teb. Kev noj tshuaj kom raug kuj tseem ceeb heev- fluoride ntau dhau tuaj yeem ua rau cov hniav fluorosis (mottling ntawm cov hniav), thaum me me dhau los tsis zoo. Los ntawm kev ua raws li cov qauv kev lag luam thiab cov kev coj ua zoo tshaj plaws, sodium fluosilicate tuaj yeem ua rau muaj kev nyab xeeb thiab muaj txiaj ntsig zoo rau pej xeem kev noj qab haus huv los ntawm dej fluoridation.