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二噁英(Dioxin)，又稱二氧雜芑,是一種無色無味、毒性嚴重的脂溶性物質.二噁英包括210種化合物，這類物質非常穩定，熔點較高，極難溶于水，可以溶于大部分有機溶劑，是無色無味的脂溶性物質，所以非常容易在生物體內積累，對人體危害嚴重。
呋喃（oxole），它有麻醉和弱刺激作用，極度易燃。吸入后可引起頭痛、頭暈、惡心、呼吸衰竭。呋喃環具芳環性質，可發生鹵化、硝化、磺化等親電取代反應，主要用于有機合成或用作溶劑。
| EF-1438 | 1,2,7,8-TCDF | (13C12, 99%) | 1.2 ML |
| EF-1442 | 2,3,7,8-TBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-1442-1.2 | 2,3,7,8-TBDF | (13C12, 99%) | 1.2 ML |
| EF-1443 | 2,3,7,8-TBDF | UNLABELED | 8 X 1.2 ML |
| EF-1443-1.2 | 2,3,7,8-TBDF | UNLABELED | 1.2 ML |
| EF-1452 | 1,2,3,7,8-PBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-1452-1.2 | 1,2,3,7,8-PBDF | (13C12, 99%) | 1.2 ML |
| EF-1453 | 1,2,3,7,8-PBDF | UNLABELED | 8 X 1.2 ML |
| EF-1453-1.2 | 1,2,3,7,8-PBDF | UNLABELED | 1.2 ML |
| EF-1454 | 2,3,4,7,8-PBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-1454-1.2 | 2,3,4,7,8-PBDF | (13C12, 99%) | 1.2 ML |
| EF-1455 | 2,3,4,7,8-PBDF | UNLABELED | 8 X 1.2 ML |
| EF-1455-1.2 | 2,3,4,7,8-PBDF | UNLABELED | 1.2 ML |
| EF-1463 | 1,2,3,4,7,8-HXBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-1463-1.2 | 1,2,3,4,7,8-HXBDF | (13C12, 99%) | 1.2 ML |
| EF-1464 | 1,2,3,4,7,8-HXBDF | UNLABELED | 8 X 1.2 ML |
| EF-1464-1.2 | 1,2,3,4,7,8-HXBDF | UNLABELED | 1.2 ML |
| EF-1486 | 1,2,3,4,6,7,8-HPBDF | UNLABELED | 8 X 1.2 ML |
| EF-1486-1.2 | 1,2,3,4,6,7,8-HPBDF | UNLABELED | 1.2 ML |
| EF-1731-A | TCDF-HPCDF WINDOW DEFINING | MIXTURE (DB-5) | 1 VIAL |
| EF-1731-S | TCDF-HPCDF WINDOW DEFINING | MIXTURE (DB-5) | 0.5 ML |
| EF-1785 | 2-MCDF | UNLABELED | 1.2 ML |
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| EF-1787-C | 2,4-DCDF | UNLABELED | 1 MG |
| EF-1788 | 2,6-DCDF | UNLABELED 50 UG/ML IN TOLUENE | 1 ML |
| EF-1788-C | 2,6-DCDF | UNLABELED | 1 MG |
| EF-1789 | 2,8-DCDF | UNLABELED 50 UG/ML IN NONANE | 1.2 ML |
| EF-1789-C | 2,8-DCDF | UNLABELED | 1 MG |
| EF-1790 | 1,2,3-TRCDF | UNLABELED | 1 ML |
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| EF-1792 | 2,4,6-TRCDF | UNLABELED 50 UG/ML IN TOLUENE | 1 ML |
| EF-1792-C | 2,4,6-TRCDF | UNLABELED | 5 MG |
| EF-1793 | 2,4,8-TRCDF | UNLABELED | 1.2 ML |
| EF-1793-C | 2,4,8-TRCDF | UNLABELED | 1 MG |
| EF-1796 | 1,2,3,4,8-PCDF | UNLABELED | 1 ML |
| EF-1796-C | 1,2,3,4,8-PCDF | UNLABELED | 1 MG |
| EF-4016 | 2,8-DICHLORODIBENZOFURAN | (13C12, 99%) | 1.2 ML |
| EF-4030 | 1,2,3,9-TCDF | UNLABELED | 1.2 ML |
| EF-4031 | 2,3,4,7-TCDF | UNLABELED | 1.2 ML |
| EF-4134 | CHLORODIBENZOFURAN MIX-HIGH | UNLABELED | 1 ML |
| EF-4138 | SAMPLING STD FOR EN-1948-2 | (U-13C12, 99%) | 1.2 ML |
| EF-4138-10 | SAMPLING STD FOR EN-1948-2 | (U-13C12, 99%) | 2 X 5 ML |
| EF-4168 | 2-MCDF | (13C12, 99%) | 1.2 ML |
| EF-4171 | 2,4-DCDF | (13C12, 99%) | 1.2 ML |
| EF-4172 | 2,4,8-TRCDF | (13C12, 99%) | 1.2 ML |
| EF-5009 | 1,3,6,8-TCDF | (13C12, 99%) 50 UG/ML IN NONANE | 1.2 ML |
| EF-5042 | NON-2,3,7,8-CONTAINING PCDF SYRINGE STANDARD | (13C12, 99%) | 1.2 ML |
| EF-5050 | 1,2,3,4,6-PCDF | (13C12, 99%) | 1.2 ML |
| EF-5052 | 1,2,3,4,6,9-HXCDF | (13C12, 99%) | 1.2 ML |
| EF-5054 | 1,2,3,4,6,8,9-HPCDF | (13C12, 99%) | 1.2 ML |
| EF-5075 | 2-MBDF | UNLABELED 5 UG/ML IN NONANE | 8 X 1.2 ML |
| EF-5076 | 2-MBDF | (13C12, 99%) 5 UG/ML IN NONANE | 4 X 1.2 ML |
| EF-5077 | 2,8-DBDF | UNLABELED 5 UG/ML IN NONANE | 8 X 1.2 ML |
| EF-5078 | 2,8-DBDF | (13C12, 99%) 5 UG/ML IN NONANE | 4 X 1.2 ML |
| EF-5079 | 2,4,8-TRBDF | UNLABELED 5 UG/ML IN NONANE | 8 X 1.2 ML |
| EF-5080 | 2,4,8-TRBDF | (13C12, 99%) 5 UG/ML IN NONANE | 4 X 1.2 ML |
| EF-5081 | 2,4,6,8-TBDF | UNLABELED 5 UG/ML IN NONANE | 8 X 1.2 ML |
| EF-5081-1.2 | 2,4,6,8-Tetrabromodibenzofuran | ||
| EF-5082 | 2,4,6,8-TBDF | (13C12, 99%) 5 UG/ML IN NONANE | 4 X 1.2 ML |
| EF-5082-1.2 | 2,4,6,8-TBDF | (13C12, 99%) 5 UG/ML IN NONANE | 1.2 ML |
| EF-5188 | NON-2,3,7,8-CONTAINING 13C FURAN SYRINGE SPIKE | (13C12, 99%) | 1.2 ML |
| EF-5259 | 1,2,3,4,6,7,8-HPBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-5259-1.2 | 1,2,3,4,6,7,8-HPBDF | (13C12, 99%) | 1.2 ML |
| EF-5263 | OBDF | UNLABELED | 8 X 1.2 ML |
| EF-5263-1.2 | OBDF | UNLABELED | 1.2 ML |
| EF-5266 | OBDF | (13C12, 99%) | 4 X 1.2 ML |
| EF-5266-1.2 | OBDF | (13C12, 99%) | 1.2 ML |
| EF-5330 | MODIFIED JIS DIOXIN & FURAN SAMPLING SPIKE | (13C12, 99%) | 1.2 ML |
| EF-5334 | MODIFIED JIS LOW CONCENTRATION SAMPLING SPIKE | (13C12, 99%) | 1.2 ML |
| EF-5384 | PBDD/F SAMPLING SPIKE STOCK | (13C12, 99%) | 1.2 ML |
| EF-5384-4X | PBDD/F SAMPLING SPIKE STOCK | (13C12, 99%) | 1.2 ML |
| EF-5394 | DIOXIN SYRINGE SPIKE | (13C12, 99%) | 1.2 ML |
| EF-5394-0.5X | DIOXIN SYRINGE SPIKE | (13C12, 99%) 10 NG/ML IN NONANE | 1.2 ML |
| EF-5410 | BROMODIOXIN/FURAN SAMPLING SPIKE | (13C12, 99%) | 1.2 ML |
| EF-903 | 2,3,7,8-TCDF | UNLABELED | 1.2 ML |
| EF-903-C | 2,3,7,8-TCDF | UNLABELED | 1 MG |
| EF-904 | 2,3,7,8-TCDF | (13C12, 99%) | 1.2 ML |
| EF-909B-25 | TCDF-HPCDF STANDARD SOLUTION B | 2,3,7,8 ISOMERS | 1.2 ML |
| EF-909B-5 | TCDF-HPCDF STANDARD SOLUTION B | 2,3,7,8 ISOMERS | 1.2 ML |
| EF-918 | 1,2,7,8-TCDF | UNLABELED | 1.2 ML |
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| EF-920 | 1,2,3,4-TCDF | (13C12, 99%) | 1.2 ML |
| EF-921 | 1,2,3,4-TCDF | UNLABELED | 1.2 ML |
| EF-921-C | 1,2,3,4-TCDF | UNLABELED | 1 MG |
| EF-939 | 1,2,8,9-TCDF | UNLABELED | 1.2 ML |
| EF-942-50 | 1,3,4,6,8-PCDF | UNLABELED 50 UG/ML IN NONANE | 1.2 ML |
| EF-943-50 | 1,2,3,4,6,8-HXCDF | UNLABELED 50 UG/ML IN NONANE | 1.2 ML |
| EF-944 | 1,3,6,8-TCDF | UNLABELED | 1.2 ML |
| EF-952 | 1,2,3,7,8-PCDF | (13C12, 99%) | 1.2 ML |
| EF-953 | 1,2,3,7,8-PCDF | UNLABELED | 1.2 ML |
| EF-953-C | 1,2,3,7,8-PCDF | UNLABELED | 1 MG |
| EF-953-M | 1,2,3,7,8-PCDF (50 ug/mL in Methanol) | UNLABELED | 1.2 ML |
| EF-954 | 1,2,3,8,9-PCDF | UNLABELED | 1.2 ML |
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| EF-956 | 2,3,4,7,8-PCDF | UNLABELED | 1.2 ML |
| EF-956-C | 2,3,4,7,8-PCDF | UNLABELED | 1 MG |
| EF-956-M | 2,3,4,7,8-PCDF | UNLABELED 50 UG/ML IN MEOH | 1.2 ML |
| EF-958 | 2,3,4,7,8-PCDF | (13C12, 99%) | 1.2 ML |
| EF-962 | 1,2,3,6,7,8-HXCDF | UNLABELED | 1.2 ML |
| EF-962-C | 1,2,3,6,7,8-HXCDF | UNLABELED | 1 MG |
| EF-963 | 1,2,3,4,7,8-HXCDF | (13C12, 99%) | 1.2 ML |
| EF-964 | 1,2,3,4,7,8-HXCDF | UNLABELED | 1.2 ML |
| EF-964-C | 1,2,3,4,7,8-HXCDF | UNLABELED | 1 MG |
| EF-965 | 1,2,3,4,8,9-HXCDF | UNLABELED | 1.2 ML |
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| EF-967 | 1,2,3,7,8,9-HXCDF | UNLABELED | 1.2 ML |
| EF-967-C | 1,2,3,7,8,9-HXCDF | UNLABELED | 1 MG |
| EF-968 | 2,3,4,6,7,8-HXCDF | UNLABELED | 1.2 ML |
| EF-968-C | 2,3,4,6,7,8-HXCDF | UNLABELED | 1 MG |
| EF-973 | 1,2,3,4,6,7,8-HPCDF | UNLABELED | 1.2 ML |
| EF-973-C | 1,2,3,4,6,7,8-HPCDF | UNLABELED | 1 MG |
| EF-974 | 1,2,3,4,6,7,8-HPCDF | (13C12, 99%) | 1.2 ML |
| EF-975 | 1,2,3,4,7,8,9-HPCDF | UNLABELED | 1.2 ML |
| EF-975-C | 1,2,3,4,7,8,9-HPCDF | UNLABELED | 1 MG |
| EF-982 | OCTACHLORODIBENZOFURAN | UNLABELED | 1.2 ML |
| EF-982-C | OCTACHLORODIBENZOFURAN | UNLABELED | 10 MG |
| EF-982-C-1 | OCTACHLORODIBENZOFURAN | UNLABELED | 1 MG |
| EF-983 | OCTACHLORODIBENZOFURAN | (13C12, 99%) | 1.2 ML |
| EF-985 | 1,2,3,6,7,8-HXCDF | (13C12, 99%) | 1.2 ML |
| EF-986 | 1,2,3,7,8,9-HXCDF | (13C12, 99%) | 1.2 ML |
| EF-987 | 2,3,4,6,7,8-HXCDF | (13C12, 99%) | 1.2 ML |
| EF-988 | 1,2,3,4,7,8,9-HPCDF | (13C12, 99%) | 1.2 ML |
| EF-999 | TCDF-OCDF STANDARD SOLUTION | (13C12, 99%) (2,3,7,8 ISOMERS) | 1.2 ML |
