Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59150 ICP Spike Mix Price on request C11020500 Carbophenothion-methyl, 10mg Price on request 679813 Sulfameter, 100 µg/ml, Methanol, 1ml Price on request