Muri 2019, FDA yo muri Amerika yatangaje icyifuzo gishya kivuga ko mubintu 16 bikoresha izuba ryizuba kuri ubu ku isoko ry’Amerika, okiside ya zinc na dioxyde de titanium yongewe ku bicuruzwa bitanga izuba nka “GRASE” (Muri rusange bizwi ko bifite umutekano kandi bifite akamaro).PABA na Trolamine Salicylate ntabwo "GRASE" yo gukoresha izuba ryinshi kubera ibibazo byumutekano.Nyamara, ibiyikubiyemo byavanyweho, kandi byumvikane ko gusa izuba ryumubiri wizuba-nano zinc oxyde na titanium dioxyde-bifite umutekano kandi bigira ingaruka nziza mubikoresho bikoresha izuba, ibindi bikoresho byangiza izuba ntabwo bifite umutekano kandi neza.Mubyukuri, gusobanukirwa kwukuri nuko nubwo FDA yo muri Amerika ifata okiside ya nano-zinc na dioxyde ya titanium "GRASE", ntibisobanura ko izindi 12 zikoresha imiti yizuba zitari GRASE, ariko ziracyafite amakuru ahagije yumutekano kugirango yerekane .Muri icyo gihe, FDA irasaba kandi ibigo bireba gutanga amakuru menshi y’umutekano.
Byongeye kandi, FDA yakoze kandi isuzuma ry’amavuriro ku “kwinjiza izuba ryinjira mu ruhu mu maraso” isanga bimwe mu bikoresho bikoresha izuba ryinshi mu zuba, iyo byinjijwe n’umubiri ku rwego rwo hejuru, bishobora gutera ibibazo by’ubuzima.ibyago.Ibyavuye mu bushakashatsi bimaze gutangazwa, byakuruye ibiganiro ku isi hose, kandi buhoro buhoro bitera ubwumvikane buke ku baguzi basanzwe batazi ukuri.Bizeraga mu buryo butaziguye ko izuba rishobora kwinjira mu maraso kandi ko ridafite umutekano ku mubiri w'umuntu, ndetse bakizera ko uruhande rumwe rwizeraga ko izuba ryangiza ubuzima kandi ko ridashobora gukoreshwa.
Biravugwa ko FDA yashakishije abakorerabushake 24, igabanyijemo amatsinda 4, kandi igerageza izuba ryinshi ririmo izuba 4 ritandukanye muri formula.Ubwa mbere, abakorerabushake batanze 75% yuruhu rwumubiri wose, ukurikije urugero rusanzwe rwa 2mg / cm2, inshuro 4 kumunsi muminsi 4 ikurikiranye kugirango bakoreshe izuba.Hanyuma, amaraso yabakorerabushake yakusanyijwe muminsi 7 ikurikiranye hanyuma hapimwa ibirimo izuba ryizuba mumaraso.Ubushakashatsi bwerekanye ko uruhu rwumuntu mukuru rugera kuri 1.5-2 ㎡.Dufate ko impuzandengo ya 1.8 ㎡, iyo ubaze ukurikije umubare usanzwe, gukoresha izuba ryizuba d nabakorerabushake ni 2 × 1.8 × 10000/1000 = 36g mubushakashatsi, kandi amafaranga inshuro 4 kumunsi ni 36 × 4 = 144g.Mubisanzwe, t uruhu rwo mumaso rugera kuri 300-350cm², uburyo bumwe bwo gukoresha izuba rirahagije kugirango urinde umunsi wose.Muri ubu buryo, umubare wimikoreshereze yabazwe ni 2 × 350/1000 = 0.7g, nubwo irangi ryarimo, ni nka 1 .0 ~ 1.5g.Niba ufashe s ntarengwa ya garama 1.5, kubara ni 144 / 1.5 = inshuro 96 .Kandi umubare wizuba ryizuba rikoreshwa nabakorerabushake muminsi 4 ikurikiranye ni 144 × 4 = 576g, mugihe ubwinshi bwizuba ryizuba ryakoreshejwe nabantu basanzwe kuri Iminsi 4 ni 1.5 × 4 = 6g.Kubwibyo, itandukaniro riri hagati ya dosiye ya garama 576 na garama 6 zizuba ryizuba ni nini cyane kandi ingaruka ziragaragara.
Imirasire y'izuba yageragejwe na FDA muri ubu bushakashatsi ni benzophenone-3, octoclilin, avobenzone, na TDSA.Muri byo, gusa amakuru yo kumenya benzophenone-3 arenze kure cyane icyo bita "agaciro k’umutekano", inshuro zigera kuri 400 zirenga igipimo gisanzwe, octocrylene na avobenzone byombi biri mu nshuro 10, na aside p-xylylenedicamphorsulfonic Ntabwo iboneka.
Mubyukuri, gukomeza gukoresha imbaraga nyinshi zokoresha izuba bizatera ingaruka.Ntabwo bitangaje kuba nizuba ryizuba rigaragara mumaraso mugihe cyibizamini bikabije.Imirasire y'izuba yemewe kandi ikoreshwa mu myaka irenga mirongo, ibihugu byinshi byagenzuye izuba ry’imiti nkimiti, kandi kugeza ubu nta makuru y’ubushakashatsi ahagije yerekana ko bifite ingaruka mbi ku mubiri w’umuntu.
Igihe cyo kohereza: Nzeri-09-2022
