TOC, short for <a target="_blank" rel="noopener noreferrer" href="https://www.leco.com/documents/203-821-679/?_gl=1*1gfpag2*_up*MQ..*_ga*MTA1NDA5NTg5OC4xNzc5NjQwNTM1*_ga_KRDSR1XM7X*czE3Nzk2NDA1MzQkbzEkZzAkdDE3Nzk2NDA1MzQkajYwJGwwJGgw*_ga_K8NYKVEKHY*czE3Nzk2NDA1MzQkbzEkZzAkdDE3Nzk2NDA1MzQkajYwJGwwJGgxOTI5MTg0MDYz">Total Organic Carbon</a>, is an important metric when analyzing soil health. Soils with high TOC content indicate high levels of biodiversity, as organic carbon fuels microbial activity. This enhanced biodiversity is incredibly beneficial to the soil. It boosts nutrient cycling and natural disease suppression, while also contributing to overall soil fertility and plant productivity.Soil biodiversity also leads to better water retention. Organic carbon binds soil particles together to make stable aggregates, which improves the overall soil structure and allows it to retain more water. This feat encourages overall plant health and the sequestration of carbon. Soils with low TOC content, however, experience limited biodiversity, leading to poor soil structure, greater amounts of erosion, and reduced crop yields.<h3>The Challenges of Determining TOC</h3>It’s important for stakeholders in the agriculture industry to pay special attention to the TOC levels in their soils if they want to get the most out of their crops. Knowing TOC levels helps to avoid blind addition of nutrients to soil, potentially cutting out unnecessary labor and costs. However, analyzing soil for TOC does come with its own set of challenges.For example, accurately distinguishing between organic and inorganic carbon requires effective separation of carbon species during analysis.<a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/products/1845"> LECO’s RC612 </a>addresses this challenge through its temperature differentiation method, precisely controlling oxidation and decomposition conditions to selectively quantify carbon fractions. Alternatively, the <a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/products/1883">C832</a>’s acid pretreatment method ensures reliable removal of inorganic carbon prior to combustion for accurate measurement of organic carbon.These approaches help mitigate common challenges such as incomplete carbonate removal, sample heterogeneity, or incomplete oxidation. While careful sample preparation remains important, leveraging instruments specifically designed to manage these variables is key to achieving precise, repeatable TOC results.<h3>Trust LECO with Your TOC</h3>Researchers and engineers at LECO have worked hard to continuously provide instrumentation that meets or exceeds expected performance. With a line of <a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/products?category=352&amp;manufacturerItems=24">carbon analyzers</a> that are suitable for TOC and more, you can trust LECO with your results, and you can count on our <a target="_blank" rel="noopener noreferrer" href="https://www.leco.com/support/?_gl=1*13d4rug*_up*MQ..*_ga*MzkzNTEwNzk1LjE3Nzk2NDA0NzQ.*_ga_K8NYKVEKHY*czE3Nzk2NDA0NzQkbzEkZzAkdDE3Nzk2NDA0NzQkajYwJGwwJGgzMzYyNzIxMzU.*_ga_KRDSR1XM7X*czE3Nzk2NDA0NzQkbzEkZzAkdDE3Nzk2NDA0NzQkajYwJGwwJGgw#">superior service</a> when your lab needs it. But don’t take our word for it—read and then click on the quotes below to discover what three different labs in countries across Europe had to say about their LECO instruments for TOC analysis:<blockquote>“We have been using these instruments since 2009, and every time they release a new version, we are impressed. They are very robust instruments, with very simple daily maintenance; they are built to work. Analysis times are very short, and their robustness, accuracy, repeatability, and precision are excellent. In short, they are instruments designed to work—the more we use them, the better they perform.”Paco San Nicolás, Head of the Ionomics Service at The Center for Soil Science and Applied Biology of Segura (CEBAS-CSIC), Murcia, Spain</blockquote>CEBAS-CSIC is a leading research center in Spain, critical for advancing sustainable soil and water management.<a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/labrulez-bucket-strapi-h3hsga3/leco_interview_with_paco_san_nicolas_csic_cebas_7c53cbb753.pdf">Read the entire interview with Paco.</a><blockquote>“…This allows us to determine the organic carbon content. In this way, we obtain both mineral and organic carbon values (TC/TOC/TIC).”“What was less common was applying a similar approach to sulfur. Existing standards dealing with sulfur mainly focus on coal but not soils. So, we combined and adapted different standards to develop a methodology suitable for soils and other geomaterials containing sulfur/sulfate species, and we now transferred this method to professional applications.”Myriam Duc, Researcher, and François Lansac, Engineering Assistant Université Gustave Eiffel, France</blockquote>Myriam Duc is known for her work regarding clay behavior, soil stabilization, and sustainable construction materials. Université Gustave Eiffel is both a university and a major research organization with a primary focus on sustainable urban development.<a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/labrulez-bucket-strapi-h3hsga3/leco_interview_with_universite_gustave_eiffel_ee64b83ece.pdf">Read their entire interview.</a><blockquote>“They (LECO instruments, including the <a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/products/1843">RC612</a>, <a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/products/1884">CHN828</a>, and AC600) are an essential part of our analysis work. We don’t use them every day, but we rely on them regularly and they are very important for our daily work. Reliability is an important feature here.”Maria Lehtinen, Lab Manager Kuusakoski’s Research Center, Lahti, Finland</blockquote>Kuusakoski’s Research Centre focuses on advancing recycling technology and material recovery. Their mission is to restore value to waste and recover precious metals from waste more efficiently.<a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/labrulez-bucket-strapi-h3hsga3/leco_interview_with_kuusakoski_research_centre_dca94b5485.pdf">Read the entire interview with Maria.</a>

Gain Confidence in Your Total Organic Carbon (TOC) Data

Test items are sometimes available from proficiency testing (PT) providers after the completion of a PT round. The purpose of this information leaflet is to advise laboratories on benefits and limitations of surplus PT items.&nbsp;<h4>Potential uses&nbsp;</h4>Surplus PT items have a number of potential uses including:&nbsp;<ul><li>Assessing new measurement procedures and verifying their correct implementation;&nbsp;</li><li>Training of new analysts;&nbsp;</li><li>Assessing the likely performance in a PT scheme;&nbsp;</li><li>Troubleshooting of measurement procedures and reassessing analytical performance following questionable or unacceptable results reported in a PT round;&nbsp;</li><li>As internal quality control (IQC) samples [1].&nbsp;</li></ul><h4>General considerations&nbsp;</h4>The following factors should be considered prior to use of surplus PT items:<ul><li>Check whether any relevant accompanying information is available and meets the end-user requirements, e.g. the assigned value and associated uncertainty of the measurand(s) of interest.&nbsp;</li><li>Assess their physical suitability and ensure that the matrix is appropriate. Some PT items have compositions close to that of routine samples, while others are synthetic or fortified (spiked). This may influence the suitability of the PT item for assessing different stages of the measurement procedure.&nbsp;</li><li>Check their availability. Surplus PT items may only be available in small numbers which will limit their usefulness for repeated testing over time, for example, as IQC samples.&nbsp;</li><li>Assess the stability information provided. PT items must be stable during the conduct of a round but there is no requirement for PT items to be assessed for stability following the completion of the round. The PT provider may be able to provide additional stability data or storage requirements, otherwise further evaluations by the end-user will be necessary.&nbsp;</li></ul><h4>Usefulness of accompanying PT data&nbsp;</h4>At the end of a PT round an assigned value is provided for each parameter, and participants’ performances are judged against a predefined performance acceptability criterion, for example, using a z score [2]. This information can support the use of surplus test items provided the following points are considered:&nbsp;<ul><li>If the assigned value is a consensus value end-users may need to reflect on the measurement procedure used to derive it;&nbsp;</li><li>Whether the metrological traceability of the assigned values makes them suitable for assessing measurement bias, for example if derived from a known spike value or a measurement made with a primary measurement procedure;</li><li>Whether the PT provider’s performance evaluation criteria agree with the fitness-for-purpose criteria required by the end-user. If so they could be used to set control limits in IQC charts. Otherwise own criteria have to be set [3].&nbsp;</li></ul><h4>Case study - Use of surplus PT items when implementing a standard method&nbsp;</h4>A laboratory wishes to adopt the standard method EN 15763 for the determination of the mass fraction of cadmium in foodstuffs by ICP-MS after microwave digestion. To this purpose, five PT items with different matrices and levels (mass fraction) were obtained from a PT provider and analysed in duplicate.&nbsp;The laboratory (i) verifies that the average of the replicates falls within the satisfactory performance range for the respective PT rounds (| z score | ≤ 2) and (ii) checks that the observed difference of the replicates does not exceed the repeatability limit (r) of the standard method.&nbsp;The data below confirms that the laboratory can operate the method correctly.<img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eurachem_Use_of_surplus_proficiency_test_items_case_study_8e190bd7d7.jpg" alt="Eurachem: Case study - Use of surplus PT items when implementing a standard method " srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eurachem_Use_of_surplus_proficiency_test_items_case_study_8e190bd7d7.jpg 245w," sizes="100vw" width="1600" height="359">

Use of surplus proficiency test items

<h3>Student and young researcher travel grants</h3>The RAFA 2026 Conference Organizing Committee is pleased to announce the offer for 5 travel grants to PhD students and early stage researchers (age limit 35 years) to attend the <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/events/928">12th International Symposium on Recent Advances in Food Analysis (RAFA 2026)</a>.High scientific quality of the contribution submitted either for poster and / or oral/young scientists´ oral presentation will be considered for evaluation.For the successful applicants registration fee will be waived and travel and accommodation costs will be reimbursed up to the amount of € 400 upon submission of a travel and accommodation expense claim after the conference.<h5>🎓 Young scientists at RAFA 2026 will benefit from:</h5><ul><li>Dedicated slots for oral presentations within the main scientific programme</li><li>Competitive travel grants for young scientists</li><li>Award(s) for the best poster presentations</li></ul>Whether you are a PhD student or an early-career researcher, RAFA 2026 offers a unique opportunity to present your work, gain international exposure and connect with leading experts in the field.<blockquote>Call for RAFA 2026 travel grants is OPEN!👉<a target="_blank" rel="noopener noreferrer" href="https://www.rafa2026.eu/draft/rafa2026_travel_grant_form.html">Submit your application here</a><ul><li>Deadline for submission of an application is May 31, 2026.</li><li>Notification of applications´ evaluation will be available on June 23, 2026.</li></ul></blockquote><h3>Registration</h3><blockquote>👉<a target="_blank" rel="noopener noreferrer" href="https://rafa.easyevent.eu/tickets/">Registration for RAFA 2026 is OPEN!</a>Early-bird registration until 30 June, 2026</blockquote>After successful submission of your registration, you will receive by e-mail (i) an automatic confirmation of receipt indicating the total amount of payment due (either for bank transfer or for on-line payment by card), (ii) login to Member section where you can administrate your profile, submit your abstracts, and from September 2026 register for satellite events, workshops and seminars. If it will not be delivered within a few minutes after submission of your registration please contact us at RAFA2026@vscht.cz.<h3>Abstract submission</h3><blockquote>👉<a target="_blank" rel="noopener noreferrer" href="https://rafa.easyevent.eu/tickets/">CALL for ABSTRACTS is OPEN!</a>In order to submit an abstract, you must first register to attend RAFA 2026. After registration you will receive an access to the Member section where you can submit your abstract(s).</blockquote>

Deadline for the RAFA 2026 Young Researcher Travel Grant is approaching

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RAFA provides an overview of contemporary trends in ANALYTICAL & BIOANALYTICAL STRATEGIES IN FOOD QUALITY AND SAFETY CONTROL and discusses CHALLENGES / NOVEL APPROACHES IN FOOD AND NATURAL PRODUCTS ANALYSIS.

Recent Advances in Food Analysis (RAFA)

Eurachem is a European network promoting international traceability of chemical measurements and good analytical practice. It provides expert guidance, supports method validation, uncertainty evaluation, proficiency testing, and facilitates discussion on technical and policy issues in analytical quality.

Eurachem

In 1936, the Laboratory Equipment Company introduced the first rapid carbon determinator for the American iron and steel industry.  Today, almost 80 years later, LECO is recognized globally as a leader in the development of high-quality analytical instrumentation, mass spectrometers, comprehensive two-dimensional chromatography, metallography & optical equipment as well as consumables.

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Deadline for the RAFA 2026 Young Researcher Travel Grant is approaching

Use of surplus proficiency test items

Gain Confidence in Your Total Organic Carbon (TOC) Data