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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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Low Level Total Residual Chlorine Concentrate - Blind Low Level Total Residual Chlorine Concentrate - Blind
SKU: QCI-096B

Low Level Total Residual Chlorine Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Low Level Total Residual Chlorine QC Concentrate CRM Low Level Total Residual Chlorine QC Concentrate CRM
SKU: QCI-096

Low Level Total Residual Chlorine QC Concentrate CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Hexavalent Chromium Concentrate - Blind Hexavalent Chromium Concentrate - Blind
SKU: QCI-095B

Hexavalent Chromium Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Hexavalent Chromium QC Concentrate CRM Hexavalent Chromium QC Concentrate CRM
SKU: QCI-095

Hexavalent Chromium QC Concentrate CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity Concentrate - Blind Turbidity Concentrate - Blind
SKU: QCI-092B

Turbidity Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Concentrate CRM Turbidity QC Concentrate CRM
SKU: QCI-092

Turbidity QC Concentrate CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
MBAs Concentrate - Blind MBAs Concentrate - Blind
SKU: QCI-091B

MBAs Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Mercury Concentrate - Blind Mercury Concentrate - Blind
SKU: QCI-088B

Mercury Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
Mercury Concentrate - Blind Mercury Concentrate - Blind
SKU: QCI-087B

Mercury Concentrate - Blind

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
Mercury QC Concentrate CRM Mercury QC Concentrate CRM
SKU: QCI-087

Mercury QC Concentrate CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
DMRQA Set 3 DMRQA Set 3
SKU: QCI-085K

DMRQA Set 3

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
UV254 Absorbance Concentrate - Blind UV254 Absorbance Concentrate - Blind
SKU: QCI-085B

UV254 Absorbance Concentrate - Blind

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