About | Otali Onyemaechi | Petroleum Chemist Nigeria
About | Otali Onyemaechi | Petroleum Chemist Nigeria
Most petroleum laboratories treat ISO 17025 accreditation as an event.
I treat it as an operating system.
I am a Senior Petroleum Chemist with 10+ years of experience in petroleum product testing, laboratory quality management, and ISO/IEC 17025 accreditation across West Africa.
At Geochem West Africa, I have been core to both our initial accreditation and its recent successful renewal — zero major findings across both ISO/IEC 17025 audit cycles.
My technical scope covers ASTM and IP test methods (D445, D4294, D86, D4052, D93, D92, D4815, D5580), nonconforming work management, measurement uncertainty evaluation, custody transfer support, and marine fuel testing to ISO 8217.
I also publish weekly content on ISO 17025 compliance, ASTM method limitations, and quality management for laboratory professionals
across Nigeria and West Africa.
→ ISO/IEC 17025:2017 Accreditation
→ ASTM & IP Test Methods
→ Measurement Uncertainty (GUM)
→ Nonconforming Work — Clause 7.10
→ Corrective Action — Clause 8.7
→ Statistical Quality Control
→ Calibration Management (CRM)
→ Marine Fuel Testing — ISO 8217
→ Custody Transfer Operations
→ Internal Auditing — ISO/IEC 17025
→ GC/FID — Shimadzu LabSolutions
→ XRF / WDXRF (ASTM D4294)
→ UV Fluorescence (ASTM D5453)
→ Density Meter (ASTM D4052)
→ SQL · Excel · Power BI · Tableau
→ Looker · Laboratory Data Analytics