Total Organic Carbon (TOC) is a widely used indicator of organic contamination in water and other aqueous samples. From pharmaceutical water systems and drinking water to industrial processes and environmental monitoring, reliable TOC measurement helps laboratories evaluate water quality and maintain process control.
But accurate TOC analysis depends on more than the analyser itself. TOC consumables, calibration standards, reagents and good laboratory practices all contribute to the reliability of the final result. Graham B. Jackson provides quality solutions to support these analytical requirements.
For laboratories looking to maintain consistent analytical performance, choosing high-quality TOC consumables and standards from Graham B. Jackson is an important part of the overall QA/QC program.
What Is Total Organic Carbon?
Total Organic Carbon represents the amount of carbon contained within organic compounds in a sample. Unlike testing for a single contaminant, TOC provides an aggregate measurement of organic carbon.
TOC analysis is therefore useful when laboratories need a rapid indication of organic contamination or changes in water quality.
Applications include:
- Pharmaceutical and purified water systems
- Drinking water monitoring
- Wastewater and environmental analysis
- Industrial process water
- Laboratory water-quality control
- Research and method development
Because TOC concentrations can be relatively low in high-purity water applications, analytical systems must be properly calibrated and controlled.
Why TOC Consumables Matter
TOC analysers depend on standards and other consumables to establish and maintain analytical performance. If a calibration standard is contaminated, incorrectly prepared or poorly handled, the instrument may produce results that appear precise but do not accurately represent the sample.
This makes the quality of TOC consumables particularly important.
A suitable TOC standard should have a clearly defined concentration, appropriate documentation and a matrix compatible with the intended analytical method.
KHP as a TOC Calibration Standard
Potassium hydrogen phthalate, commonly abbreviated as KHP, is widely used as a carbon source for TOC calibration solutions.
A defined KHP-based standard provides a known carbon concentration that can be used to establish or verify the response of a TOC analyser.
The important point is not simply the nominal concentration. Laboratories should also review the accompanying certificate, traceability information, expiry date, storage requirements and preparation details before using a standard.
This documentation becomes especially valuable when analytical results must be demonstrated during internal reviews, audits or regulated laboratory processes.
TOC Consumables and Analytical Accuracy
Calibration is only one part of maintaining reliable TOC results. Handling and storage can also influence analytical performance.
Graham B. Jackson recommends several good practices for analytical standards, including avoiding direct insertion of transfer devices into stock solutions and transferring an aliquot into a suitable secondary container. This reduces the possibility of contaminating the original standard.
Laboratories should also:
- Check containers for damage or contamination.
- Follow the manufacturer’s specified storage conditions.
- Use standards before their expiry date.
- Maintain appropriate preparation and usage records.
- Avoid unnecessary exposure of standards to the laboratory environment.
These simple controls can help minimise avoidable sources of analytical variation.
Choosing the Right TOC Consumables
When selecting TOC consumables and standards, laboratories should consider several factors.
Concentration
Select a standard appropriate for the calibration range and analytical method used by the TOC instrument.
Matrix
Ensure that the standard’s matrix is suitable for the intended application and does not introduce unnecessary interference.
Traceability
Review the certificate and traceability information supplied with the product. A well-documented standard provides stronger evidence for laboratory QA/QC.
Stability and Storage
Follow the manufacturer’s storage requirements and monitor expiry dates. Improper storage can compromise the integrity of analytical standards.
Documentation
Retain certificates, safety documentation, and product specifications according to the laboratory’s quality-management procedures.
Why Source TOC Consumables from a Specialist Supplier?
Preparing analytical standards internally can add calculations, weighing, dilution, and documentation requirements. In-house preparation can increase the risk of calculation, dilution, matrix and contamination errors.
Using professionally manufactured standards can simplify laboratory workflows while providing consistent documentation and defined specifications.
GBJ supplies laboratory standards and consumables from established manufacturers, helping Australian laboratories access reliable products for analytical testing and quality control.
Conclusion
Accurate TOC measurement begins before the sample reaches the analyser.
From calibration standards and other TOC consumables to correct handling and storage, every stage of the workflow can influence the reliability of analytical results. Using well-characterised standards, following documented procedures and maintaining appropriate QA/QC practices gives laboratories greater confidence in their TOC data. Graham B. Jackson provides reliable solutions to support these analytical requirements.
For laboratories performing routine water analysis, process monitoring or high-purity water testing, selecting the right TOC consumables is a practical step towards more consistent and defensible analytical results.
FAQs
- What are TOC consumables?
TOC consumables include calibration standards, reagents and other laboratory supplies required to operate and maintain a Total Organic Carbon analysis workflow. - What is KHP used for in TOC analysis?
Potassium hydrogen phthalate (KHP) is used as a defined carbon source for preparing or supplying TOC calibration standards. - Why is proper handling of TOC standards important?
Poor handling can introduce contamination or alter the standard, potentially affecting calibration and the reliability of analytical results. - Where are TOC measurements used?
TOC analysis is used across pharmaceutical water systems, drinking water, wastewater, environmental monitoring, industrial processes and laboratory water-quality applications.
For Further Enquiry Contact: sales@gbjpl.com.au