The proficiency testing studies help improve quality and comply with regulations. Order the NSI PT Express™, our on-demand proficiency testing, when you have an immediate need for proficiency test results.

These environmental chemistry soil and hazardous waste proficiency tests are designed for identification of target chemicals in the soil and underground storage tanks (UST).

Environmental Chemistry Wastewater PT Express samples may take 7 to 10 business days to ship. If you need the samples sooner, please call NSI at 1-800-234-7837 to expedite your order.

For determination of:
Ammonia as N: 300 to 3000 mg/kg
Kjeldahl nitrogen (TKN): 400 to 4000 mg/kg
Total Phosphorus: 300 to 3000 mg/kg
Total Organic Carbon (TOC): 1000 to 15000 mg/kg