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Environmental Certified Reference Materials and Proficiency Test Standards

Our wastewater standards enhance your testing accuracy and efficiency. Regular use of our certified reference materials (CRMs) and proficiency test (PT) standards ensures high data quality and supports accreditation needs.

We specialize in ISO-accredited CRMs and effluent standards that are stable and integrate seamlessly into routine workflows. Pre-measured, single-use materials help prevent errors and simplify processes. For example, try our GGA Concentrate Snips™: just snip and pour into a 300 mL BOD bottle—no measurements or contamination. Our versatile, multiparameter CRMs streamline testing procedures, reducing the need for multiple CRMs in your lab. Watch the demonstration video to learn more!

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1,998 Items found

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NO3 CRM NO3 CRM
SKU: IS-005

NO3 CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
NO2 CRM NO2 CRM
SKU: IS-004

NO2 CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
NH3 CRM NH3 CRM
SKU: IS-003

NH3 CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
N-NH3 CRM N-NH3 CRM
SKU: IS-002

N-NH3 CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
COD CRM (500 mL) COD CRM (500 mL)
SKU: IS-001H

COD CRM (500 mL)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
COD CRM COD CRM
SKU: IS-001

COD CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
  • Top rated
Assurance® Interference Check Standard 5 for AA & ICP (500 mL) Assurance® Interference Check Standard 5 for AA & ICP (500 mL)
SKU: INTER5-500

Assurance® Interference Check Standard 5 for AA & ICP (500 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 6,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
  • Top rated
Assurance® Interference Check Standard 5 for AA & ICP (125 mL) Assurance® Interference Check Standard 5 for AA & ICP (125 mL)
SKU: INTER5-100

Assurance® Interference Check Standard 5 for AA & ICP (125 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 6,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
  • Top rated
Assurance® Interference Check Standard 18 without Mercury for AA & ICP (500 mL) Assurance® Interference Check Standard 18 without Mercury for AA & ICP (500 mL)
SKU: INTER18-500N

Assurance® Interference Check Standard 18 without Mercury for AA & ICP (500 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 20,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
  • Top rated
  • KIT
Assurance® Interference Check Standard 18 with Mercury for AA & ICP (500 mL) Assurance® Interference Check Standard 18 with Mercury for AA & ICP (500 mL)
SKU: INTER18-500

Assurance® Interference Check Standard 18 with Mercury for AA & ICP (500 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 20,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
  • Top rated
Assurance® Interference Check Standard 18 without Mercury for AA & ICP (125 mL) Assurance® Interference Check Standard 18 without Mercury for AA & ICP (125 mL)
SKU: INTER18-100N

Assurance® Interference Check Standard 18 without Mercury for AA & ICP (125 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 20,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
  • Top rated
  • KIT
Assurance® Interference Check Standard 18 with Mercury for AA & ICP (125 mL) Assurance® Interference Check Standard 18 with Mercury for AA & ICP (125 mL)
SKU: INTER18-100

Assurance® Interference Check Standard 18 with Mercury for AA & ICP (125 mL)

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  • Brand Spex
  • Matrix 5% HNO3
  • Concentration 20,000 µg/mL
  • Raw Material Five 9s & Purification as available
  • Certification Single: Direct ICP Analysis
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