EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675837 3-Chloro-1,2-propanediol, 250mg Price on request 50624 Nitrite (NO2-) as N Price on request 12073.12-100MG Nalidixic acid,neat,neat,100mg, Price on request