Environmental standards - BOD, TOC, COD, TSS and TDS Standards
Wastewater Organic Strength Measurement Overview
| Method | Description |
|---|---|
| BOD5 | 5-day Biochemical Oxygen Demand — commonly used by municipal wastewater treatment plants. |
| COD | Chemical Oxygen Demand — preferred by industrial facilities for quicker, toxin-resistant analysis. |
| TOC | Total Organic Carbon — non-specific indicator measuring organic carbon in water. |
CRMs for BOD5 Testing – GGA Snips™
- Formulated from certified high-purity chemicals for consistency.
- Certified against NIST SRM — ensures accuracy and provides traceability to SI units.
- Single-use packaging prevents lab cross-contamination.
- Sterilized post-packaging — stable for over 3 years at room temperature.
CRMs & RMs for Residual Chlorine – Chlorine Snips™
- No pipets or glassware required — just use the instrument cuvette and dilute.
- Ideal for use at remote or field testing sites.
- Packaged in flame-sealed ampules — convenient and accurate.
Total Organic Carbon (TOC)
TOC measures the carbon content of organic compounds in water. It's calculated as:
TOC = Total Carbon (TC) - Inorganic Carbon (TIC)
For Non-Purgeable Organic Carbon (NPOC), inorganic carbon is removed by purging with acidified air or nitrogen before measurement.
Chemical Oxygen Demand (COD)
- Uses a strong oxidizer to convert organic matter into CO2 and H2O.
- Provides results within 1.5 to 3 hours — faster than BOD.
- Useful for estimating BOD once correlation is established.
- Resistant to toxins — ideal for industrial wastewater analysis.
TSS vs. TDS
| Parameter | Description |
|---|---|
| TSS | Total Suspended Solids — dry weight of undissolved particles retained by a filter. |
| TDS | Total Dissolved Solids — fully dissolved substances; analyzed separately from TSS. |