Spike Sample Standard 2A (Water) Back Catalog number: 52029 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71151 Caffeine, 1000µg/ml in MeOH, 1ml Price on request ASTM-P-0135 System Performance Standard, in Heptane, 1x5ml Price on request 50478 Selenium (Se) Price on request