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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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Volatile Solids Wastewater PT Standard (2 pack) Volatile Solids Wastewater PT Standard (2 pack)
SKU: PEI-127

Volatile Solids Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
Settleable Solids (2 pack) Settleable Solids (2 pack)
SKU: PEI-126

Settleable Solids (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
MBAs Wastewater PT Standard (2 pack) MBAs Wastewater PT Standard (2 pack)
SKU: PEI-124

MBAs Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Bromide Wastewater PT Standard (2 pack) Bromide Wastewater PT Standard (2 pack)
SKU: PEI-110

Bromide Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Concentration 1.0 - 10 mg/L
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
TOX Wastewater PT Standard (2 pack) TOX Wastewater PT Standard (2 pack)
SKU: PEI-104

TOX Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Silica Wastewater PT Standard (2 pack) Silica Wastewater PT Standard (2 pack)
SKU: PEI-101

Silica Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Nitrite (2 pack) Nitrite (2 pack)
SKU: PEI-100

Nitrite (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
Acidity Wastewater PT Standard (2 pack) Acidity Wastewater PT Standard (2 pack)
SKU: PEI-099

Acidity Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Low-Level Total Residual Chlorine (2 pack) Low-Level Total Residual Chlorine (2 pack)
SKU: PEI-096

Low-Level Total Residual Chlorine (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Hexavalent Chromium (2 pack) Hexavalent Chromium (2 pack)
SKU: PEI-095

Hexavalent Chromium (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity (2 pack) Turbidity (2 pack)
SKU: PEI-092

Turbidity (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Mercury (2 pack) Mercury (2 pack)
SKU: PEI-087

Mercury (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
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