Th\u1eddi gian qua, nhi\u1ec1u v\u1ee5 vi\u1ec7c s\u1eed d\u1ee5ng h\u00f3a ch\u1ea5t c\u1ea5m trong tr\u1ed3ng tr\u1ecdt v\u00e0 ch\u0103n nu\u00f4i b\u1ecb ph\u00e1t hi\u1ec7n, g\u00e2y ra hoang mang, lo l\u1eafng cho ng\u01b0\u1eddi ti\u00eau d\u00f9ng. \u0110\u00e2y l\u00e0 v\u1ea5n \u0111\u1ec1 h\u1ebft s\u1ee9c nghi\u00eam tr\u1ecdng, g\u00e2y \u1ea3nh h\u01b0\u1edfng s\u1ee9c kh\u1ecfe c\u1ed9ng \u0111\u1ed3ng.<\/p>\n
V\u00ed d\u1ee5 1:<\/strong>\u00a0<\/strong>Salbutamol l\u00e0 ch\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u00e0o ch\u1ebf thu\u1ed1c l\u00e0m gi\u00e3n ph\u1ebf qu\u1ea3n tr\u1ecb hen suy\u1ec5n v\u00e0 hi\u1ec7n v\u1eabn \u0111\u01b0\u1ee3c B\u1ed9 Y t\u1ebf c\u1ea5p ph\u00e9p nh\u1eadp kh\u1ea9u. Tuy nhi\u00ean, t\u1eeb l\u00e2u T\u1ed5 ch\u1ee9c L\u01b0\u01a1ng th\u1ef1c v\u00e0 N\u00f4ng nghi\u1ec7p Li\u00ean H\u1ee3p Qu\u1ed1c (FAO) \u0111\u00e3 khuy\u1ebfn c\u00e1o kh\u00f4ng s\u1eed d\u1ee5ng ch\u1ea5t n\u00e0y trong ch\u0103n nu\u00f4i do c\u00f3 nhi\u1ec1u t\u00e1c \u0111\u1ed9ng nguy hi\u1ec3m t\u1edbi s\u1ee9c kh\u1ecfe con ng\u01b0\u1eddi n\u1ebfu t\u00edch l\u0169y l\u00e2u d\u00e0i trong c\u01a1 th\u1ec3.<\/p>\n Hi\u1ec7n nay, v\u00ec l\u1ee3i \u00edch kinh t\u1ebf tr\u01b0\u1edbc m\u1eaft, nhi\u1ec1u trang tr\u1ea1i ch\u0103n nu\u00f4i \u1edf Vi\u1ec7t Nam \u0111\u00e3 tr\u1ed9n thu\u1ed1c n\u00e0y v\u00e0o th\u1ee9c \u0103n gia s\u00fac \u0111\u1ec3 l\u1ee3n l\u1edbn nhanh h\u01a1n, m\u00f4ng, vai n\u1edf h\u01a1n, t\u1ef7 l\u1ec7 n\u1ea1c cao h\u01a1n v\u00e0 m\u00e0u s\u1eafc th\u1ecbt \u0111\u1ecf \u0111\u1eb9p h\u01a1n…, g\u00e2y ra r\u1ea5t nhi\u1ec1u lo l\u1eafng, b\u1ee9c x\u00fac \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi ti\u00eau d\u00f9ng.<\/p>\n V\u1ec1 m\u1eb7t h\u00f3a h\u1ecdc, salbutamol l\u00e0 m\u1ed9t ch\u1ea5t h\u1eefu c\u01a1 c\u00f3 c\u00f4ng th\u1ee9c ph\u00e2n t\u1eed tr\u00f9ng v\u1edbi c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n nh\u1ea5t v\u00e0 h\u00e0m l\u01b0\u1ee3ng c\u00e1c nguy\u00ean t\u1ed1 C, H, O, N l\u1ea7n l\u01b0\u1ee3t l\u00e0 65,27%; 8,79%; 5,86%; 20,08%. C\u00f4ng th\u1ee9c ph\u00e2n t\u1eed c\u1ee7a salbutamol l\u00e0<\/p>\n A.\u00a0<\/strong>C26H40N2O6 V\u00ed d\u1ee5 2:<\/strong>\u00a0<\/strong>\u0110\u1ec3 khi\u1ebfn m\u1ed9t s\u1ed1 lo\u1ea1i tr\u00e1i c\u00e2y nh\u01b0 xo\u00e0i, chu\u1ed1i… ch\u00edn \u0111\u1ec1u, v\u00e0ng, \u0111\u1eb9p, c\u00e1c ti\u1ec3u th\u01b0\u01a1ng th\u01b0\u1eddng s\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c truy\u1ec1n th\u1ed1ng l\u00e0 \u1ee7 b\u1eb1ng \u0111\u1ea5t \u0111\u00e8n. Tuy nhi\u00ean, c\u00e1ch l\u00e0m n\u00e0y ti\u1ec1m \u1ea9n nhi\u1ec1u nguy c\u01a1 \u1ea3nh h\u01b0\u1edfng s\u1ee9c kh\u1ecfe v\u00e0 s\u1ef1 an to\u00e0n c\u1ee7a ng\u01b0\u1eddi s\u1eed d\u1ee5ng do c\u00e1c t\u1ea1p ch\u1ea5t trong \u0111\u1ea5t \u0111\u00e8n khi \u1ee7 c\u00f3 th\u1ec3 s\u1ea3n sinh ra photphin (PH3) v\u00e0 c\u00e1c h\u1ee3p ch\u1ea5t ch\u1ee9a asen (th\u1ea1ch t\u00edn) \u0111\u1ec1u l\u00e0 nh\u1eefng ch\u1ea5t r\u1ea5t \u0111\u1ed9c.<\/p>\n Ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0\u00a0kh\u00f4ng<\/strong>\u00a0\u0111\u00fang?<\/p>\n A.<\/strong>\u00a0\u0110\u1ea5t \u0111\u00e8n c\u00f3 th\u00e0nh ph\u1ea7n ch\u00ednh l\u00e0 canxi cacbua (CaC2). V\u00ed d\u1ee5 3:<\/strong>\u00a0<\/strong>Th\u00e1ng 10\/2015, c\u00e1c chuy\u00ean gia c\u1ee7a C\u01a1 quan qu\u1ed1c t\u1ebf nghi\u00ean c\u1ee9u ung th\u01b0 c\u1ee7a WHO (IARC) c\u1ea3nh b\u00e1o c\u00e1c lo\u1ea1i th\u1ecbt x\u00f4ng kh\u00f3i, gi\u0103m b\u00f4ng, x\u00fac x\u00edch… l\u00e0 m\u1ed1i \u0111e d\u1ecda ung th\u01b0 l\u1edbn nh\u1ea5t cho s\u1ee9c kh\u1ecfe c\u1ee7a con ng\u01b0\u1eddi, ngang v\u1edbi c\u00e1c t\u00e1c nh\u00e2n kh\u00e1c nh\u01b0 amiang, asen (th\u1ea1ch t\u00edn), thu\u1ed1c l\u00e1…<\/p>\n Nguy\u00ean nh\u00e2n d\u1eabn t\u1edbi vi\u1ec7c n\u00e0y l\u00e0 c\u00e1c lo\u1ea1i th\u1ef1c ph\u1ea9m ch\u1ebf bi\u1ebfn tr\u00ean s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 ch\u1ea5t ph\u1ee5 gia v\u00e0 ch\u1ea5t b\u1ea3o qu\u1ea3n c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ung th\u01b0. M\u1ed9t trong s\u1ed1 \u0111\u00f3 l\u00e0 natri nitrit (mu\u1ed1i di\u00eam), ch\u1ea5t n\u00e0y v\u1ed1n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m cho th\u1ecbt c\u00f3 m\u00e0u h\u1ed3ng \u2013 \u0111\u1ecf v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i vi khu\u1ea9n g\u00e2y ng\u1ed9 \u0111\u1ed9c.<\/p>\n Nh\u01b0ng b\u00ean c\u1ea1nh \u0111\u00f3, natri nitrit c\u00f3 th\u1ec3 t\u00e1c d\u1ee5ng v\u1edbi c\u00e1c amin t\u1ed3n t\u1ea1i t\u1ef1 nhi\u00ean trong th\u1ef1c ph\u1ea9m t\u1ea1o th\u00e0nh nitrosamin l\u00e0 ch\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ung th\u01b0 r\u1ea5t m\u1ea1nh.<\/p>\n Ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0\u00a0kh\u00f4ng<\/strong>\u00a0\u0111\u00fang?<\/p>\n A.<\/strong>\u00a0Natri nitrit l\u00e0 m\u1ed9t ch\u1ea5t tham gia v\u00e0o qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p mu\u1ed1i \u0111iazoni v\u00e0 ph\u1ea9m nhu\u1ed9m azo.<\/p>\n B.<\/strong>\u00a0Natri nitrit l\u00e0 s\u1ea3n ph\u1ea9m c\u1ee7a ph\u1ea3n \u1ee9ng nhi\u1ec7t ph\u00e2n mu\u1ed1i natri nitrat. V\u00ed d\u1ee5 4:<\/strong>\u00a0<\/strong>Trong m\u1ed9t s\u1ed1 qu\u1ea3ng c\u00e1o tr\u00ean truy\u1ec1n h\u00ecnh, ta th\u01b0\u1eddng th\u1ea5y gi\u1edbi thi\u1ec7u v\u1ec1 lo\u1ea1i n\u01b0\u1edbc t\u01b0\u01a1ng an to\u00e0n \u201ckh\u00f4ng c\u00f3 3-MCPD\u201d. \u0110\u00e2y l\u00e0 ch\u1ea5t \u0111\u1ed9c sinh ra trong qu\u00e1 tr\u00ecnh l\u00ean men t\u1ef1 nhi\u00ean d\u00f9ng trong s\u1ea3n xu\u1ea5t t\u01b0\u01a1ng truy\u1ec1n th\u1ed1ng, l\u00e0 t\u00e1c nh\u00e2n g\u00e2y ung th\u01b0 r\u1ea5t m\u1ea1nh. Bi\u1ebft t\u00ean \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a 3-MCPD l\u00e0 3-MonoCloPropan\u0110iol, c\u00f4ng th\u1ee9c c\u1ea5u t\u1ea1o t\u01b0\u01a1ng \u1ee9ng c\u1ee7a n\u00f3 l\u00e0<\/p>\n A.<\/strong>\u00a0HO-CH2-CHOH-CH2Cl\u00a0\u00a0\u00a0<\/strong> V\u00ed d\u1ee5 5:<\/strong>\u00a0<\/strong>Sudan l\u00e0 1 nh\u00f3m ph\u1ea9m m\u00e0u azo \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00f4ng nghi\u1ec7p, th\u1ef1c ph\u1ea9m v\u00e0 m\u1ef9 ph\u1ea9m. Tuy nhi\u00ean, th\u1eddi gian g\u1ea7n \u0111\u00e2y, sudan d\u1ea7n b\u1ecb h\u1ea1n ch\u1ebf v\u00e0 c\u1ea5m s\u1eed d\u1ee5ng do \u0111\u01b0\u1ee3c ch\u1ee9ng minh c\u00f3 th\u1ec3 l\u00e0m t\u0103ng nguy c\u01a1 b\u1ecb ung th\u01b0 tr\u00ean ng\u01b0\u1eddi.<\/p>\n Sudan g\u1ed3m nhi\u1ec1u lo\u1ea1i, trong \u0111\u00f3 Sundan I l\u00e0 ch\u1ea5t h\u1eefu c\u01a1 c\u00f3 m\u00e0u \u0111\u1ecf th\u1eabm th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea1o m\u00e0u \u0111\u1ecf trong c\u00e1c lo\u1ea1i th\u1ef1c ph\u1ea9m, \u1edbt b\u1ed9t, t\u01b0\u01a1ng \u1edbt, t\u01b0\u01a1ng c\u00e0, pizza…. v\u00e0 son m\u00f4i.<\/p>\n Trong Sudan I, C chi\u1ebfm 77,42%C; 4,84%H; 11,29%N v\u00e0 6,45%O v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng. Bi\u1ebft CTPT c\u1ee7a Sudan I tr\u00f9ng v\u1edbi CT \u0111\u01a1n gi\u1ea3n nh\u1ea5t. CTPT c\u1ee7a Sudan I l\u00e0<\/p>\n A.<\/strong>\u00a0C24H20N4O V\u00ed d\u1ee5 6:<\/strong>\u00a0<\/strong>C\u00e1c lo\u1ea1i h\u1ed9p x\u1ed1p \u0111\u1ef1ng th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn tr\u00ean th\u1ecb tr\u01b0\u1eddng hi\u1ec7n nay ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb nh\u1ef1a polipropilen (PP) v\u00e0 polistiren (PS).<\/p>\n \u0110\u00e2y l\u00e0 nh\u1eefng lo\u1ea1i nh\u1ef1a kh\u00f4ng \u0111\u1ed9c h\u1ea1i v\u00e0 an to\u00e0n. Tuy nhi\u00ean, PS c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m l\u00e0 d\u1ec5 b\u1ecb nhi\u1ec7t ph\u00e2n, ngay \u1edf nhi\u1ec7t \u0111\u1ed9 kho\u1ea3ng 100\u00a0oC, s\u1ea3n ph\u1ea9m t\u1ea1o th\u00e0nh l\u00e0 c\u00e1c ph\u00e2n t\u1eed stiren.<\/p>\n Ngo\u00e0i ra, qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t PS c\u00f3 th\u1ec3 c\u00f2n t\u1ed3n d\u01b0 m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf etylbenzen v\u00e0 stiren. C\u00e1c h\u1ee3p ch\u1ea5t th\u01a1m nh\u01b0 etylbezen v\u00e0 stiren \u0111\u1ec1u l\u00e0 nh\u1eefng ho\u00e1 ch\u1ea5t g\u00e2y ung th\u01b0 m\u1ea1nh, \u1ea3nh h\u01b0\u1edfng gan tu\u1ef5 v\u00e0 th\u1ea7n kinh. Ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang?<\/p>\n A.<\/strong>\u00a0Propilen, stiren v\u00e0 etylbenzen \u0111\u1ec1u l\u00e0m m\u1ea5t m\u00e0u dung d\u1ecbch brom \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng. V\u00ed d\u1ee5 7:<\/strong>\u00a0<\/strong>Trong \u1ea9m th\u1ef1c truy\u1ec1n th\u1ed1ng Vi\u1ec7t Nam, c\u00f3 m\u1ed9t th\u1ee9 \u0111\u1eb7c s\u1ea3n kh\u00f4ng th\u1ec3 kh\u00f4ng nh\u1eafc t\u1edbi l\u00e0 c\u00e1c lo\u1ea1i “r\u01b0\u1ee3u thu\u1ed1c”. C\u00e1ch th\u1ee9c l\u00e0m r\u01b0\u1ee3u thu\u1ed1c nh\u00ecn chung \u0111\u1ec1u \u0111\u01a1n gi\u1ea3n, ch\u1ec9 c\u1ea7n s\u01a1 ch\u1ebf c\u00e1c lo\u1ea1i th\u1ea3o d\u01b0\u1ee3c, \u0111\u1ed9ng v\u1eadt ho\u1eb7c b\u1ed9 ph\u1eadn c\u1ee7a ch\u00fang r\u1ed3i ng\u00e2m v\u1edbi r\u01b0\u1ee3u tr\u1eafng c\u00f3 n\u1ed3ng \u0111\u1ed9 cao trong th\u1eddi gian t\u1ed1i thi\u1ec3u kho\u1ea3ng 100 ng\u00e0y l\u00e0 d\u00f9ng \u0111\u01b0\u1ee3c.<\/p>\n Nghi\u00ean c\u1ee9u khoa h\u1ecdc c\u0169ng cho th\u1ea5y trong th\u00e0nh ph\u1ea7n c\u1ee7a c\u00e1c lo\u1ea1i r\u01b0\u1ee3u thu\u1ed1c \u0111\u1ec1u c\u00f3 ch\u1ee9a r\u1ea5t nhi\u1ec1u ho\u1ea1t ch\u1ea5t sinh h\u1ecdc c\u00f3 “d\u01b0\u1ee3c t\u00ednh” qu\u00fd, g\u00f3p ph\u1ea7n ch\u1eefa \u0111\u01b0\u1ee3c nhi\u1ec1u lo\u1ea1i b\u1ec7nh v\u00e0 n\u00e2ng cao s\u1ee9c kh\u1ebb, th\u1ec3 tr\u1ea1ng. C\u01a1 s\u1edf khoa h\u1ecdc c\u1ee7a vi\u1ec7c ng\u00e2m r\u01b0\u1ee3u l\u00e0<\/p>\n A.<\/strong>\u00a0Ancol etylic c\u00f3 nhi\u1ec7t \u0111\u1ed9 s\u00f4i th\u1ea5p h\u01a1n n\u01b0\u1edbc n\u00ean c\u00f3 th\u1ec3 l\u00e0m c\u00e1c ho\u1ea1t ch\u1ea5t sinh h\u1ecdc d\u1ec5 bay h\u01a1i h\u01a1n. V\u00ed d\u1ee5 8:<\/strong>\u00a0<\/strong>Th\u1ecbt g\u00e1c b\u1ebfp l\u00e0 m\u00f3n \u0103n \u0111\u1eb7c s\u1ea3n \u0111\u1ed9c \u0111\u00e1o c\u1ee7a \u0111\u1ed3ng b\u00e0o Th\u00e1i \u0111en \u1edf v\u00f9ng cao T\u00e2y B\u1eafc chuy\u00ean d\u00f9ng \u0111\u1ec3 thi\u1ebft \u0111\u00e3i kh\u00e1ch qu\u00fd. Ch\u1ec9 b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p t\u1ea9m \u01b0\u1edbp c\u00e1c lo\u1ea1i gia v\u1ecb v\u00e0 hun kh\u00f3i b\u1ebfp m\u00e0 kh\u00f4ng c\u1ea7n d\u00f9ng th\u00eam ch\u1ea5t b\u1ea3o qu\u1ea3n n\u00e0o, th\u1ecbt g\u00e1c b\u1ebfp c\u00f3 th\u1ec3 d\u1ef1 tr\u1eef \u0111\u01b0\u1ee3c trong v\u00f2ng 1 th\u00e1ng. H\u00f3a ch\u1ea5t n\u00e0o d\u01b0\u1edbi \u0111\u00e2y trong kh\u00f3i b\u1ebfp c\u00f3 t\u00e1c d\u1ee5ng gi\u1eef cho th\u1ecbt kh\u00f4ng b\u1ecb h\u1ecfng?<\/p>\n A.<\/strong>\u00a0Phenol v\u00e0 foman\u0111ehit\u00a0\u00a0\u00a0\u00a0\u00a0<\/strong> V\u00ed d\u1ee5 9:<\/strong>\u00a0<\/strong>T\u00e0o ph\u1edb (c\u00f2n g\u1ecdi l\u00e0 ph\u1edb, t\u00e0u h\u0169…) l\u00e0 m\u00f3n \u0103n v\u1eb7t l\u00e0m t\u1eeb \u0111\u1eadu t\u01b0\u01a1ng \u0111\u01b0\u1ee3c \u01b0a th\u00edch \u1edf ch\u00e2u \u00c1. T\u01b0\u01a1ng t\u1ef1 \u0111\u1eadu ph\u1ee5, \u0111\u1ec3 l\u00e0m t\u00e0o ph\u1edb, trong c\u00e1ch l\u00e0m truy\u1ec1n th\u1ed1ng, ng\u01b0\u1eddi ta th\u00eam “n\u01b0\u1edbc chua” v\u00e0o dung d\u1ecbch n\u01b0\u1edbc \u0111\u1eadu t\u01b0\u01a1ng \u0111\u00e3 \u0111\u01b0\u1ee3c n\u1ea5u ch\u00edn (\u0111\u1eadu t\u01b0\u01a1ng \u0111\u01b0\u1ee3c xay c\u00f9ng v\u1edbi n\u01b0\u1edbc r\u1ed3i l\u1ecdc v\u00e0 \u0111un s\u00f4i), khi \u0111\u00f3 “\u00f3c \u0111\u1eadu” s\u1ebd b\u1ecb\u00a0k\u1ebft t\u1ee7a, sau khi tr\u1ea3i qua qu\u00e1 tr\u00ecnh l\u1ecdc, \u00e9p… ch\u1ebf bi\u1ebfn, s\u1ebd thu \u0111\u01b0\u1ee3c th\u00e0nh ph\u1ea9m t\u01b0\u01a1ng \u1ee9ng.<\/p>\n G\u1ea7n \u0111\u00e2y, v\u00ec l\u1ee3i nhu\u1eadn, nhi\u1ec1u ng\u01b0\u1eddi s\u1ea3n xu\u1ea5t \u0111\u1eadu ph\u1ee5, t\u00e0o ph\u1edb thay v\u00ec d\u00f9ng “n\u01b0\u1edbc chua” \u0111\u1ec3 l\u00e0m “\u00f3c \u0111\u1eadu” l\u1ea1i thay th\u1ebf b\u1eb1ng th\u1ea1ch cao g\u00e2y ra nhi\u1ec1u lo ng\u1ea1i v\u1ec1 v\u1ea5n \u0111\u1ec1 v\u1ec7 sinh, an to\u00e0n th\u1ef1c ph\u1ea9m.<\/p>\n K\u1ebft lu\u1eadn n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang?<\/p>\n A.<\/strong>\u00a0\u0110\u1eadu t\u01b0\u01a1ng c\u00f3 h\u00e0m l\u01b0\u1ee3ng \u0111\u1ea1m cao nh\u1edd c\u00f3 vi khu\u1ea9n c\u1ed1 \u0111\u1ecbnh \u0111\u1ea1m k\u00fd sinh trong n\u1ed1t s\u1ea7n c\u1ee7a r\u1ec5 c\u00e2y. V\u00ed d\u1ee5 10:<\/strong>\u00a0<\/strong>\u0110\u1ec3 s\u00e1t tr\u00f9ng (di\u1ec7t vi khu\u1ea9n) c\u00e1c lo\u1ea1i rau \u0103n s\u1ed1ng (salad, n\u1ed9m, g\u1ecfi, ….) tr\u01b0\u1edbc khi \u0103n ng\u01b0\u1eddi ta th\u01b0\u1eddng ng\u00e2m ch\u00fang v\u1edbi dung d\u1ecbch n\u01b0\u1edbc mu\u1ed1i lo\u00e3ng trong kho\u1ea3ng 10 \u2013 15 ph\u00fat. T\u00e1c d\u1ee5ng di\u1ec7t khu\u1ea9n c\u1ee7a n\u01b0\u1edbc mu\u1ed1i trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y l\u00e0 do<\/p>\n A.\u00a0<\/strong>Dung d\u1ecbch NaCl \u0111i\u1ec7n li ra ion Na+, ion n\u00e0y c\u00f3 t\u00ednh baz\u01a1 m\u1ea1nh n\u00ean ti\u00eau di\u1ec7t \u0111\u01b0\u1ee3c vi khu\u1ea9n. (T\u1ed5ng h\u1ee3p)<\/p>\n<\/div>\n \n","protected":false},"excerpt":{"rendered":" B\u00ean c\u1ea1nh v\u1ea5n \u0111\u1ec1 \u0111ang r\u1ea5t th\u1eddi s\u1ef1 l\u00e0 \u00f4 nhi\u1ec5m m\u00f4i tr\u01b0\u1eddng v\u00e0 bi\u1ebfn \u0111\u1ed5i kh\u00ed h\u1eadu, m\u1ed9t ch\u1ee7 \u0111\u1ec1 c\u0169ng nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 quan t\u00e2m l\u1edbn c\u1ee7a x\u00e3 h\u1ed9i hi\u1ec7n nay l\u00e0 v\u1ec7 sinh an to\u00e0n th\u1ef1c ph\u1ea9m v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan t\u1edbi s\u1ee9c kh\u1ecfe. Th\u1eddi gian qua, nhi\u1ec1u v\u1ee5 vi\u1ec7c […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[159],"tags":[],"yoast_head":"\n
\nB. C13H21NO3\u00a0\u00a0\u00a0\u00a0<\/strong>
\nC.\u00a0<\/strong>C7H11NO2
\nD.\u00a0<\/strong>C13H23NO3<\/p>\n
\nB.<\/strong>\u00a0Khi cho k\u1ebdm photphua (Zn3P2\u00a0\u2013 b\u1ea3 chu\u1ed9t) v\u00e0o n\u01b0\u1edbc c\u0169ng thu \u0111\u01b0\u1ee3c photphin.
\nC.<\/strong>\u00a0Ph\u1ea3n \u1ee9ng th\u1ee7y ph\u00e2n canxi cacbua trong n\u01b0\u1edbc thu\u1ed9c lo\u1ea1i ph\u1ea3n \u1ee9ng oxi h\u00f3a \u2013 kh\u1eed.<\/strong>
\nD.<\/strong>\u00a0\u0110\u1ec3 \u1ee7 ch\u00edn hoa qu\u1ea3 nhanh v\u00e0 an to\u00e0n h\u01a1n, c\u00f3 th\u1ec3 thay th\u1ebf C2H2\u00a0sinh ra t\u1eeb \u0111\u1ea5t \u0111\u00e8n b\u1eb1ng C2H4.<\/p>\n
\nC.<\/strong>\u00a0Trong c\u00f4ng nghi\u1ec7p, \u0111\u1ec3 \u0111i\u1ec1u ch\u1ebf N2, c\u00f3 th\u1ec3 nung h\u1ed7n h\u1ee3p natri nitrit v\u1edbi amoni clorua.<\/strong>
\nD.<\/strong>\u00a0Kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed c\u1ee7a natri nitrit l\u00e0 69.<\/p>\n
\nB.<\/strong>\u00a0HO-CH2-CHCl-CH2OH
\nC.<\/strong>\u00a0H2N-CH2-CH(NH2)-CH2Cl
\nD.<\/strong>\u00a0HO-CH2-CHOH-CHCl-CH3<\/p>\n
\nB.<\/strong>\u00a0C18H16N2O
\nC.<\/strong>\u00a0C22H16N4O
\nD.<\/strong>\u00a0C16H12N2O<\/strong><\/p>\n
\nB.<\/strong>\u00a0Ph\u1ea3n \u1ee9ng nhi\u1ec7t ph\u00e2n polistiren c\u00f2n g\u1ecdi l\u00e0 ph\u1ea3n \u1ee9ng \u0111epolime ho\u00e1.
\n<\/strong>C.<\/strong>\u00a0S\u1eed d\u1ee5ng h\u1ed9p x\u1ed1p \u0111\u1ec3 \u0111\u1ef1ng th\u1ef1c ph\u1ea9m ngu\u1ed9i l\u00e0 nguy hi\u1ec3m, b\u1ecb c\u1ea5m s\u1eed d\u1ee5ng.
\nD.<\/strong>\u00a0Propilen, stiren v\u00e0 etylbenzen \u0111\u1ec1u c\u00f3 th\u1ec3 tham gia ph\u1ea3n \u1ee9ng tr\u00f9ng h\u1ee3p.<\/p>\n
\nB.<\/strong>\u00a0Ancol etylic l\u00e0 dung m\u00f4i t\u1ed1t, h\u00f2a tan \u0111\u01b0\u1ee3c nhi\u1ec1u ho\u1ea1t ch\u1ea5t sinh h\u1ecdc c\u1ea3 ph\u00e2n c\u1ef1c v\u00e0 kh\u00f4ng ph\u00e2n c\u1ef1c.
\n<\/strong>C.<\/strong>\u00a0Ancol etylic t\u00e1c d\u1ee5ng h\u00f3a h\u1ecdc v\u1edbi c\u00e1c ho\u1ea1t ch\u1ea5t sinh h\u1ecdc t\u1ea1o th\u00e0nh c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 “d\u01b0\u1ee3c t\u00ednh” m\u1ea1nh h\u01a1n.
\nD.<\/strong>\u00a0Ancol etylic ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc v\u1edbi c\u00e1c ho\u1ea1t ch\u1ea5t sinh h\u1ecdc l\u00e0m cho ch\u00fang tr\u1edf n\u00ean “ngon” h\u01a1n.<\/p>\n
\nB.<\/strong>\u00a0CO2
\nC.<\/strong>\u00a0CO
\nD.<\/strong>\u00a0K2CO3<\/p>\n
\nB.<\/strong>\u00a0“N\u01b0\u1edbc chua” \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong qu\u00e1 tr\u00ecnh l\u00e0m \u0111\u1eadu b\u1ea3n ch\u1ea5t l\u00e0 dung d\u1ecbch axit c\u00f3 pH cao.
\nC.<\/strong>\u00a0S\u1ef1 h\u00ecnh th\u00e0nh “\u00f3c \u0111\u1eadu” c\u00f3 b\u1ea3n ch\u1ea5t l\u00e0 s\u1ef1 bi\u1ebfn t\u00ednh v\u00e0 \u0111\u00f4ng t\u1ee5 c\u1ee7a protein d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a axit.
\n<\/strong>D.<\/strong>\u00a0\u0110\u1ec3 t\u00e0o ph\u1edb thu \u0111\u01b0\u1ee3c r\u1eafn ch\u1eafc v\u00e0 \u0111\u1eb9p m\u1eaft h\u01a1n n\u00ean th\u00eam v\u00e0o qu\u00e1 tr\u00ecnh ch\u1ebf bi\u1ebfn th\u1eadt nhi\u1ec1u th\u1ea1ch cao.<\/p>\n
\nB. Vi khu\u1ea9n ch\u1ebft v\u00ec m\u1ea5t n\u01b0\u1edbc do th\u1ea9m th\u1ea5u.
\n<\/strong>C.\u00a0<\/strong>Dung d\u1ecbch NaCl \u0111i\u1ec7n li ra ion Na+, ion n\u00e0y c\u00f3 t\u00ednh oxi h\u00f3a m\u1ea1nh n\u00ean ti\u00eau di\u1ec7t \u0111\u01b0\u1ee3c vi khu\u1ea9n.
\nD.\u00a0<\/strong>Dung d\u1ecbch NaCl \u0111i\u1ec7n li ra ion Cl-, ion n\u00e0y c\u00f3 t\u00ednh oxi h\u00f3a m\u1ea1nh n\u00ean ti\u00eau di\u1ec7t \u0111\u01b0\u1ee3c vi khu\u1ea9n.<\/p>\n