Tam sim no, muaj ntau ntau hom ntawm ntsev: dawb, liab, dub, ntxiv, iodized, noj zaub mov, hiav txwv, thiab lwm yam, txhua tus ntawm nws muaj nws lub hom phiaj. Yog li, koj yuav tsum paub xaiv nws li cas thiaj raug.
Cov Lus Qhia
Kauj ruam 1
Thaum txais yuav ntsev, them nyiaj rau qhov loj ntawm cov muaju. Cov ntsev ntxiv yog ib txwm ua rau hauv av. Rau lwm yam ntau yam, tus naj npawb grind yog qhia tshwj xeeb. Qhov siab tshaj plaws lossis thawj qib ntsev muaj qhov sib tsoo ntawm No. 0, uas yog, 70% ntawm cov kua siv lead ua tsis muaj ntau tshaj 0.8 millimeters, thiab 10% ntawm cov kua siv lead ua kom tsis pub ntau tshaj 1.2 millimeters. Rau cov ntsev ntawm kev sib tsoo No. 1: 85% ntawm cov muaju yuav tsum tsis ntau tshaj 1, 2 millimeters qhov loj me, thiab 3% - tsis ntau tshaj 2.5 millimeters. Rau cov ntsev sib tsoo No. 2: 90% ntawm cov muaju yuav tsum tsis ntau tshaj 2.5 millimeters, thiab 5% - tsis ntau tshaj 4 millimeters. Rau ntsev ntawm kev sib tsoo No. 3: 85% ntawm cov muaju yuav tsum tsis ntau tshaj 4 millimeters, thiab 15% - ntau dua 4 millimeters. Hom ntsev yog nws cov yam ntxwv kev ua haujlwm, uas qhia meej meej npaum li cas thiab ua kom tiav yog qhov ua kom zoo zoo. Nws ntseeg tau tias qhov loj dua ntsev, muaj kev noj qab haus huv ntau dua.
Kauj ruam 2
Saib ntawm hom kev tsim ua ntsev: - ntsev ntsev muaj ntau qhov dej ntawm sodium chloride (txog li 99%) thiab qhov tsawg kawg nkaus ntawm kev ya raws; - ntsev yaj tas li kuj muaj cov ntsev sodium ntau heev; - ntsev ntsev 94-98% sodium chloride thiab lwm yam ions, ua tsaug uas nws muaj lwm txoj kev saj; - ntsev tus kheej rau lub cev muaj tsawg kawg ntawm sodium chloride, yog li nws muaj txiaj ntsig ntau dua rau kev noj qab haus huv.
Kauj ruam 3
Yog tias koj xav tau khoom siv iodized, tom qab ntawd xyuam xim rau yam khoom twg nws muaj cov tshuaj ntxiv - iodide lossis potassium iodate. Zoo dua yog tias qhov thib ob, hauv daim ntawv no, iodine yuav ruaj khov dua. Tsis tas li ntawd, lub txee lub neej ntawm cov txiaj ntsig zoo ntawm iodine tsis yog ntau dua 2 xyoos. Qhov no txhais tau hais tias tom qab lub sijhawm no, koj tuaj yeem tshem tawm cov ntsev.
Kauj ruam 4
Tam sim no, cov ntsev dub kim kim yog nrov heev. Nws muaj ntau dua kev noj qab haus huv dua li dawb thiab muaj ntau ntawm iodine, potassium, leej faj, hlau thiab lwm yam kab kawm. Tab sis nws muaj lub ntsej muag zoo nkauj uas tsis yog txhua tus nyiam.
