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Groningen 2025: from MIC fundamentals to field interpretation

The four-day programme covered MIC assessment and diagnostic methods, with a strong emphasis on external pipeline MIC, cathodic protection and the interpretation of evidence. The official Euro-MIC course programme documents the teaching schedule. [1]

MICBUSTERS and Hanze University supported local organisation, alongside the wider Euro-MIC teaching network and industry partners including Gasunie and Nebest. The faculty brought together expertise in molecular diagnostics, chemistry, cathodic protection and failure analysis. [2]

The programme was developed within Euro-MIC, the European MIC Network, established through COST Action CA20130. That COST Action ran during 2021–2025; its training resources remain useful for industry. This article looks back at the Groningen course and shares practical applications of its approach.

Five practical lessons for better MIC investigations

MIC describes corrosion influenced by microorganisms and their interactions with the material and environment. Microorganisms can be present without causing the observed damage. A credible diagnosis therefore needs multiple lines of evidence (MLOE), rather than a single positive microbiological result. [3]

1. Sample the location that matters to corrosion

Bulk water helps track what is moving through a system, but a surface biofilm or deposit can have a different microbial community and local chemistry. Where accessible, collect material associated with the damaged surface, a relevant coupon or deposit as well as the surrounding water. Record the location and operating conditions so that the sample can be linked to the engineering question. [9]

Pig debris can be a useful composite sample, but its interpretation should account for the fact that it may represent several pipeline locations. Read more about why a produced-water sample cannot confirm or exclude MIC on its own.

2. Check analytical quality before interpreting a number

DNA recovery and PCR inhibition can affect the result. Use appropriate extraction blanks, negative and positive controls, and inhibition checks. Evaluate the assay’s detection and quantification limits and replicate agreement. An inhibited sample should be investigated, rather than reported as an uncomplicated negative. These principles align with the emphasis on validation and transparent reporting in MIQE 2.0. [5]

3. Keep the target and reporting basis consistent

qPCR quantifies a selected DNA target. A broad microbial assay and a functional-gene assay answer different questions. For example, suitably designed dsrAB assays can target sulfate-reducing populations, while mcrA assays can target methanogenic populations; interpretation depends on assay specificity and coverage. Detecting those targets does not establish the corrosiveness of the organisms in that asset. [3]

Compare results using the same sampling and analytical approach. State the denominator clearly: gene copies per millilitre of water, per sampled square centimetre or per gram of material are different measurements. Gene copies should not automatically be presented as living cell counts. Our guide to dsrAB, aprA, mcrA, MicC and MicH explains target selection in more detail.

4. Distinguish DNA detection from treatment performance

Standard DNA-based qPCR can detect DNA from inactivated cells. A positive result after biocide treatment therefore does not, by itself, prove treatment failure. A decrease also needs interpretation alongside sample timing, analytical quality and independent indicators of activity or viability. Recent research using an oilfield-derived microbial consortium reinforces this distinction. [6]

For practical examples, see does qPCR detect dead cells after biocide treatment?

5. Connect microbiology to damage, chemistry and history

Combine microbial findings with corrosion measurements, material examination, water and deposit chemistry, and operating history. Ask whether they support a plausible mechanism at the affected location. Document competing explanations and remaining uncertainty before recommending mitigation or further testing. The Euro-MIC laboratory pilot procedure also emphasises combining microbiological, metallurgical and chemical evidence. [4]

How qPCR, ATP and sequencing contribute to MIC assessment

The diagnostic methods used during the Groningen course provide complementary information. Their outputs should be interpreted according to what each method actually measures.

This is an interpretation guide, not a ranking of methods. The combination should fit the asset and investigation. [3] [4]

For a closer comparison, read qPCR, ATP and Bactiquant for oilfield microbial monitoring.

From MIC training to on-site qPCR monitoring

MICBUSTERS helps turn a sampling plan into targeted measurements close to the asset. Our portable on-site qPCR solution combines sample preparation, DNA extraction, ready-to-use assays, a compact thermocycler and interpretation support.

A prepared workflow can typically deliver selected qPCR results in approximately two hours. Actual timing depends on the sample matrix, pretreatment and test panel. Suitable workflows can be developed for water, filters, swabs, biofilms, deposits and pig debris.

The practical benefit is earlier access to targeted information: comparing sampling locations, following microbial trends and planning the next investigation while a field team is still on site. Treatment decisions remain linked to analytical controls and the wider corrosion evidence.

Frequently asked questions about MIC training