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Scheduled Proficiency Testing & PT Express™ for Environmental Testing

  • Certified for environmental methods — plate counts, MPN
  • COA includes expected values for multiple methods
  • Robust — lyophilized technique ensures strong recovery, even for 44.5 ºC coliform methods
  • Unique — multi-organism CRM covers six methods in a single pellet

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DMRQA

The Discharge Monitoring Report-Quality Assurance Study Program (DMRQA) plays a critical role in monitoring compliance with environmental regulations, ensuring the accuracy of data, identifying trends and patterns, and promoting transparency and accountability in environmental management.

Drinking Water Standards

NSI offers a wide range of Certified Reference Materials (CRMs) for drinking water analysis to ensure environmental and human health. Offerings include testing standards for pH, residual free chlorine, turbidity, trace metals, mercury, fluoride, and nitrite.

Legionella

Legionella certified reference materials are crucial for ensuring the accuracy and reliability of testing methods used to detect the presence of Legionella bacteria in water systems.

Soil/UST Standards

Soil and Underground Storage Tank (UST) standards are fundamental regulations established to preserve the environment and human health from hazards associated with underground storage tanks.

Wastewater Standards

Wastewater analysis is a powerful public and environmental health tool. We are laser-focused on manufacturing and delivering unique ISO-accredited Certified Reference Materials (CRMs) that are not only stable but also easy to use and implement.

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Sulfide Wastewater PT Standard (2 pack) Sulfide Wastewater PT Standard (2 pack)
SKU: PEI-086

Sulfide Wastewater PT Standard (2 pack)

  • CCL
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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
DMRQA Set 3 DMRQA Set 3
SKU: PEI-085K

DMRQA Set 3

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
DMRQA Set 2 DMRQA Set 2
SKU: PEI-084K

DMRQA Set 2

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
DMRQA Set 1 DMRQA Set 1
SKU: PEI-083K

DMRQA Set 1

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Full DMRQA Set Full DMRQA Set
SKU: PEI-082K

Full DMRQA Set

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Residue (2 pack) Residue (2 pack)
SKU: PEI-079

Residue (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
EPA Inorganics NPW Set EPA Inorganics NPW Set
SKU: PEI-037K

EPA Inorganics NPW Set

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  • Brand NSI
  • Raw Material >95% min
  • Certification Single: Grav. w/Analytical Confirmation
Full NELAC Inorganics Set Full NELAC Inorganics Set
SKU: PEI-035K

Full NELAC Inorganics Set

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  • Brand NSI
  • Raw Material >95% min
  • Certification Single: Grav. w/Analytical Confirmation
pH (2 pack) pH (2 pack)
SKU: PEI-035

pH (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Trace Metals (2 pack) Trace Metals (2 pack)
SKU: PEI-034

Trace Metals (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
Total Residual Chlorine (2 pack) Total Residual Chlorine (2 pack)
SKU: PEI-033

Total Residual Chlorine (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Total Phenolics (2 pack) Total Phenolics (2 pack)
SKU: PEI-032

Total Phenolics (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
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