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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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Total Residual Chlorine Concentrate CRM 0.500 mg/L Total Residual Chlorine Concentrate CRM 0.500 mg/L
SKU: QCI-184

Total Residual Chlorine Concentrate CRM 0.500 mg/L

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  • Brand NSI
  • Concentration 0.500 mg/L
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Total Residual Chlorine Concentrate CRM 0.100 mg/L Total Residual Chlorine Concentrate CRM 0.100 mg/L
SKU: QCI-183

Total Residual Chlorine Concentrate CRM 0.100 mg/L

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  • Brand NSI
  • Concentration 0.100 mg/L
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Total Residual Chlorine Concentrate CRM 0.050 mg/L Total Residual Chlorine Concentrate CRM 0.050 mg/L
SKU: QCI-182

Total Residual Chlorine Concentrate CRM 0.050 mg/L

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  • Brand NSI
  • Concentration 0.050 mg/L
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Multi-Analyte Solids CRM Multi-Analyte Solids CRM
SKU: QCI-171

Multi-Analyte Solids CRM

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Check Standards 5 NTU (500 mL) Turbidity QC Check Standards 5 NTU (500 mL)
SKU: QCI-156

Turbidity QC Check Standards 5 NTU (500 mL)

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  • Brand NSI
  • Concentration 5 NTU
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Check Standards 10 NTU (500 mL) Turbidity QC Check Standards 10 NTU (500 mL)
SKU: QCI-155

Turbidity QC Check Standards 10 NTU (500 mL)

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  • Brand NSI
  • Concentration 10 NTU
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Check Standards 25 NTU (500 mL) Turbidity QC Check Standards 25 NTU (500 mL)
SKU: QCI-154

Turbidity QC Check Standards 25 NTU (500 mL)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Check Standards 50 NTU (500 mL) Turbidity QC Check Standards 50 NTU (500 mL)
SKU: QCI-153

Turbidity QC Check Standards 50 NTU (500 mL)

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  • Brand NSI
  • Concentration 50 NTU
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Turbidity QC Check Standards 100 NTU (500 mL) Turbidity QC Check Standards 100 NTU (500 mL)
SKU: QCI-152

Turbidity QC Check Standards 100 NTU (500 mL)

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  • Brand NSI
  • Concentration 100 NTU
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Stable Sulfide Standard 10mg/mL Stable Sulfide Standard 10mg/mL
SKU: QCI-147

Stable Sulfide Standard 10mg/mL

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  • Brand NSI
  • Concentration 10mg/mL
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Stable Sulfide Standard 1mg/mL Stable Sulfide Standard 1mg/mL
SKU: QCI-147L

Stable Sulfide Standard 1mg/mL

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  • Brand NSI
  • Concentration 1mg/mL
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
Perchlorate Concentrate - Blind Perchlorate Concentrate - Blind
SKU: QCI-146B

Perchlorate Concentrate - Blind

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