\u00d4 t\u00f4 l\u00e0 m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ti\u1ec7n ch\u00ednh c\u1ee7a giao th\u00f4ng \u0111\u00f4 th\u1ecb hi\u1ec7n \u0111\u1ea1i. H\u1eb1ng ng\u00e0y h\u00e0ng v\u1ea1n chi\u1ebfc \u00f4 t\u00f4 ch\u1ea1y tr\u00ean kh\u1eafp c\u00e1c ph\u1ed1 l\u1edbn ph\u1ed1 nh\u1ecf c\u1ee7a th\u00e0nh ph\u1ed1, gi\u00fap con ng\u01b0\u1eddi \u0111i l\u1ea1i thu\u1eadn ti\u1ec7n, \u0111\u1ed3ng th\u1eddi c\u0169ng g\u00e2y \u00f4 nhi\u1ec5m nghi\u00eam tr\u1ecdng m\u00f4i tr\u01b0\u1eddng. Ch\u00fang ta bi\u1ebft r\u1eb1ng, \u00f4 t\u00f4 nh\u1edd \u0111\u1ed1t ch\u00e1y x\u0103ng \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ed9ng l\u1ef1c. Trong qu\u00e1 tr\u00ecnh ch\u00e1y, x\u0103ng to\u1ea3 ra c\u00e1c ch\u1ea5t kh\u00ed c\u00f3 h\u1ea1i, ch\u1eb3ng h\u1ea1n nh\u01b0 ch\u00ec, s\u1ebd t\u1ea1o n\u00ean s\u1ef1 nhi\u1ec5m \u0111\u1ed9c v\u1ec1 ch\u00ec, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ee9c kho\u1ebb con ng\u01b0\u1eddi.<\/p>\n\n\n\n
T\u1ea1i sao trong x\u0103ng l\u1ea1i c\u00f3 ch\u00ec? \u0110\u00f3 l\u00e0 do ng\u01b0\u1eddi ta \u0111\u00e3 ch\u1ebf v\u00e0o x\u0103ng m\u1ed9t ch\u1ea5t ph\u1ee5 gia ch\u1ed1ng k\u00edch n\u1ed5 l\u00e0 ch\u00ec tetraetyl, ch\u1ea5t n\u00e0y c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n t\u00ecnh tr\u1ea1ng l\u00e0m vi\u1ec7c c\u1ee7a \u0111\u1ed9ng c\u01a1 \u00f4 t\u00f4, gi\u1ea3m ma s\u00e1t. Theo ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf, lo\u1ea1i x\u0103ng h\u00e0m l\u01b0\u1ee3ng ch\u00ec \u00edt h\u01a1n 0,013 gam\/l\u00edt th\u00ec g\u1ecdi l\u00e0 x\u0103ng kh\u00f4ng ch\u00ec, h\u00e0m l\u01b0\u1ee3ng 0,013 – 1,1 gam\/l\u00edt g\u1ecdi l\u00e0 x\u0103ng ch\u00ec th\u1ea5p, h\u00e0m l\u01b0\u1ee3ng ch\u00ec l\u1edbn h\u01a1n 1,1 gam\/l\u00edt g\u1ecdi l\u00e0 x\u0103ng pha ch\u00ec. Tuy nhi\u00ean, ch\u00ednh l\u00e0 ch\u1ea5t tetraetyl \u0111\u00f3 \u0111\u00e3 g\u00e2y n\u00ean s\u1ef1 \u00f4 nhi\u1ec5m ch\u00ec trong b\u1ea7u kh\u00f4ng kh\u00ed. M\u1ed9t m\u1eb7t n\u00f3 theo s\u1ef1 ch\u00e1y c\u1ee7a x\u0103ng bay th\u1eb3ng v\u00e0o b\u1ea7u kh\u00f4ng kh\u00ed, m\u1eb7t kh\u00e1c chuy\u1ec3n ho\u00e1 th\u00e0nh ch\u1ea5t d\u1ec5 bay h\u01a1i th\u1ea3i ra theo kh\u00ed x\u1ea3 c\u1ee7a \u00f4 t\u00f4. Ch\u00ec c\u00f3 th\u1ec3 l\u00e0m t\u1ed5n th\u01b0\u01a1ng \u0111\u1ebfn h\u1ec7 th\u1ea7n kinh v\u00e0 \u0111\u1ea1i n\u00e3o c\u1ee7a con ng\u01b0\u1eddi, \u0111\u1ed3ng th\u1eddi, c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ung th\u01b0. Theo t\u00ednh to\u00e1n, m\u1ed7i ng\u01b0\u1eddi m\u1ed7i ng\u00e0y c\u00f3 th\u1ec3 h\u00edt v\u00e0o 30 microgam ch\u00ec, trong \u0111\u00f3 c\u00f3 40% b\u1ecb c\u01a1 th\u1ec3 h\u1ea5p th\u1ee5, n\u00f3 t\u00edch t\u1ee5 d\u1ea7n d\u1ea7n trong c\u01a1 th\u1ec3, g\u00e2y nguy h\u1ea1i cho s\u1ee9c kho\u1ebb con ng\u01b0\u1eddi. Ngo\u00e0i ra, v\u00ec t\u1ef7 tr\u1ecdng c\u1ee7a c\u00e1c h\u1ee3p ch\u1ea5t trong ch\u00ec th\u01b0\u1eddng l\u1edbn h\u01a1n kh\u00f4ng kh\u00ed, sau khi th\u1ea3i ra kh\u1ecfi \u00f4 t\u00f4, th\u01b0\u1eddng l\u01a1 l\u1eedng c\u00e1ch m\u1eb7t \u0111\u1ea5t 0,5 m\u00e9t, do \u0111\u00f3 \u0111\u1ed1i v\u1edbi tr\u1ebb em c\u00f3 chi\u1ec1u cao v\u00e0 kh\u00f4ng gian ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7m cao \u1ea5y c\u0169ng b\u1ecb \u0111e do\u1ea1 nghi\u00eam tr\u1ecdng. Tr\u00fang \u0111\u1ed9c ch\u00ec l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh r\u1ea5t ch\u1eadm ch\u1ea1p, n\u00f3 c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm s\u1ef1 ph\u00e1t d\u1ee5c v\u00e0 l\u00e0m gi\u1ea3m tr\u00ed l\u1ef1c \u1edf tr\u1ebb em.<\/p>\n\n\n\n
\u0110\u1ec3 b\u1ea3o v\u1ec7 s\u1ee9c kho\u1ebb c\u1ee7a nh\u00e2n d\u00e2n, c\u1ea3i thi\u1ec7n t\u00ecnh tr\u1ea1ng \u00f4 nhi\u1ec5m m\u00f4i tr\u01b0\u1eddng hi\u1ec7n nay, vi\u1ec7c \u0111\u1ec1 x\u01b0\u1edbng s\u1eed d\u1ee5ng x\u0103ng kh\u00f4ng ch\u00ec \u0111\u00e3 tr\u1edf th\u00e0nh c\u1ea5p thi\u1ebft kh\u00f4ng th\u1ec3 tr\u00ec ho\u00e3n. C\u01a1 quan ban ng\u00e0nh c\u00f3 li\u00ean quan c\u1ee7a Nh\u00e0 n\u01b0\u1edbc Trung Qu\u1ed1c \u0111\u00e3 ra quy\u1ebft \u0111\u1ecbnh y\u00eau c\u1ea7u t\u00e1m th\u00e0nh ph\u1ed1 l\u1edbn nh\u01b0 B\u1eafc Kinh, Thi\u00ean T\u00e2n, Th\u01b0\u1ee3ng H\u1ea3i v.v. th\u1ef1c hi\u1ec7n \u0111i \u0111\u1ea7u trong vi\u1ec7c d\u00f9ng x\u0103ng kh\u00f4ng ch\u00ec, \u0111\u1ebfn cu\u1ed1i n\u0103m 2000 ho\u00e0n to\u00e0n c\u1ea5m s\u1ea3n xu\u1ea5t, ti\u00eau th\u1ee5 v\u00e0 s\u1eed d\u1ee5ng x\u0103ng c\u00f3 pha ch\u00ec.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: X\u0103ng kh\u00f4ng pha ch\u00ec.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u00d4 t\u00f4 l\u00e0 m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ti\u1ec7n ch\u00ednh c\u1ee7a giao th\u00f4ng \u0111\u00f4 th\u1ecb hi\u1ec7n \u0111\u1ea1i. H\u1eb1ng ng\u00e0y h\u00e0ng v\u1ea1n chi\u1ebfc \u00f4 t\u00f4 ch\u1ea1y tr\u00ean kh\u1eafp c\u00e1c ph\u1ed1 l\u1edbn ph\u1ed1 nh\u1ecf c\u1ee7a th\u00e0nh ph\u1ed1, gi\u00fap con ng\u01b0\u1eddi \u0111i l\u1ea1i thu\u1eadn ti\u1ec7n, \u0111\u1ed3ng th\u1eddi c\u0169ng g\u00e2y \u00f4 nhi\u1ec5m nghi\u00eam tr\u1ecdng m\u00f4i tr\u01b0\u1eddng. Ch\u00fang ta bi\u1ebft r\u1eb1ng, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,16],"tags":[],"class_list":["post-8830","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-ky-thuat"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8830","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=8830"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8830\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8830"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8830"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8830"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}