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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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SKU: 678

Formaldehyde

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  • Brand NSI
  • Matrix Methanol
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
SKU: 675

Cyclohexanone

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  • Brand NSI
  • Matrix Acetonitrile
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 659

2-Methyl-1-propanol

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  • Brand NSI
  • Matrix PT Methanol
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 654

Disulfoton

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  • Brand NSI
  • Matrix Acetone
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 652

2,3,5,6-Tetrachlorophenol

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  • Brand NSI
  • Matrix CH2Cl2
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 644

2,3,4-Trichlorophenol

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  • Brand NSI
  • Matrix CH2Cl2
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 642

3,4-Dichlorophenol

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  • Brand NSI
  • Matrix Methanol
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 623

Diallate

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  • Brand NSI
  • Matrix CH2Cl2
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 622

Endothall

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  • Brand NSI
  • Matrix Methanol
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 611

Dicrotophos

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  • Brand NSI
  • Matrix Methanol
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 596

Dibenz(a,j)anthracene

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  • Brand NSI
  • Matrix MeCl2
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
SKU: 574

Chlorobenzilate

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  • Brand NSI
  • Matrix Methanol
  • Raw Material >95% min
  • Certification Gravimetric and/or Volumetric
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