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If the number is lower than the TCLP limit
this retention time has noticeably shifted to any less than 80% of the original recorded value
8-Trimethylcarbazole
1005 C 5mL Syringe (1/4-28)
EC HPLC guard column (analytical), NUCLEODUR C18 Gravity-SB, 3 µm, 4x3 mm Nickel test If the number is lowerFor protection of your main HPLC column from contamination, it is recommended to use guard columns. These short columns are placed into a guard column holder. The guard column holder in combination with a guard column inside is installed between the injector and the HPLC column. This installation prevents chemical impurities to reach the main column. Because a contamination could form an irreversible bond with the column packing material (stationary
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