硫酸钡,Barium sulfate;for white standard DIN 5033
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碳酸甲乙酯,Ethyl methyl carbonate [EMC];99.9%, acid <10 ppm, H2O <10ppm
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β-胡萝卜素,β-Carotene;synthetic, ≥93% (UV), powder
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L-缬氨酸,L-Valine;PharmaGrade, ≥98.5%
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柠檬酸,Citric acid;certified reference material, TraceCERT®
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二甲苯,Xylenes;reagent grade, ≥75.0% (xylenes isomers)
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苯甲醛,Benzaldehyde;puriss. p.a., ≥99.0% (GC)