Sigma-Aldrich
甲醇, suitable for HPLC, ≥99.9%
Sigma-Aldrich
甲醇, ACS reagent, ≥99.8%
Sigma-Aldrich
二氯甲烷, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
硫酸, ACS reagent, 95.0-98.0%
Sigma-Aldrich
二氯甲烷, suitable for HPLC, ≥99.8%, contains amylene as stabilizer
Sigma-Aldrich
甲醇, anhydrous, 99.8%
Sigma-Aldrich
二氯甲烷, contains 40-150 ppm amylene as stabilizer, ACS reagent, ≥99.5%
Sigma-Aldrich
尿素, ACS reagent, 99.0-100.5%
Sigma-Aldrich
二氯甲烷, HPLC Plus, for HPLC, GC, and residue analysis, ≥99.9%, contains 50-150 ppm amylene as stabilizer
Sigma-Aldrich
甲醇, HPLC Plus, ≥99.9%
Sigma-Aldrich
甲醇, suitable for HPLC, gradient grade, ≥99.9%
Sigma-Aldrich
尿素, powder, BioReagent, for molecular biology, suitable for cell culture
Sigma-Aldrich
乙酸酐, ReagentPlus®, ≥99%
Sigma-Aldrich
硼酸, ACS reagent, ≥99.5%
Sigma-Aldrich
甲醇, suitable for HPLC, gradient grade, suitable as ACS-grade LC reagent, ≥99.9%
Sigma-Aldrich
甲醇, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8% (GC)
Sigma-Aldrich
尿素, ReagentPlus®, ≥99.5%, pellets
Sigma-Aldrich
硫脲, ACS reagent, ≥99.0%
Sigma-Aldrich
硼酸, BioReagent, for molecular biology, suitable for cell culture, suitable for plant cell culture, ≥99.5%
Supelco
尿素, 8 M (after reconstitution with 16 mL high purity water)
Sigma-Aldrich
尿素 溶液, BioUltra, ~8 M in H2O
Supelco
甲醇, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
尿素, puriss., meets analytical specification of Ph. Eur., BP, USP, 99.0-100.5%, 99.0-101.0% (calc. on dry substance)
Sigma-Aldrich
二氯甲烷, puriss. p.a., ACS reagent, reag. ISO, ≥99.9% (GC)
Sigma-Aldrich
硫酸, puriss. p.a., for determination of Hg, ACS reagent, reag. ISO, reag. Ph. Eur., 95.0-97.0%
USP
木精, United States Pharmacopeia (USP) Reference Standard
Sigma-Aldrich
乙酸酐, ACS reagent, ≥98.0%
Supelco
甲醇, analytical standard
Supelco
硫酸浓缩液, 0.1 M H2SO4 in water (0.2N), eluent concentrate for IC