About us


Welcome to Testing Method SOP — a specialized blog dedicated to scientific water and wastewater testing methods, standardized operating procedures (SOPs), environmental monitoring, and analytical techniques used in laboratories and field analysis.

I’m Shambhu Kumar Yadav, a Senior Environmental & Hazardous Waste Management Executive with over 15 years of experience in environmental compliance, laboratory operations, quality assurance (QA/QC), and hazardous waste management across India and Qatar. My work has involved leading complex analytical programs, implementing international standards like ISO/IEC 17025:2017, and ensuring regulatory compliance in industrial and field settings.

With experience in handling instruments such as GC‑MS, ICP‑OES, AAS, UV‑Vis spectrophotometers, CHNS analyzers, and advanced laboratory systems, I bring practical insight into how environmental testing and water quality assessment are conducted in real‑world laboratory and field environments.

Testing Method SOP exists to provide clear, reliable, and scientifically grounded procedures that explain how tests are performed, why they are important, and how the resulting data is interpreted. The blog covers topics such as:

Standard methods for water and wastewater analyses

Detailed SOPs for specific tests (e.g., TDS, TSS, nitrite, sulphide, organic carbon)

Laboratory best practices for QA/QC

Interpretation of test results for environmental compliance

All procedures and methods presented on this site are framed to help students, laboratory professionals, environmental engineers, and quality managers understand how environmental testing works in practice — with a focus on safety, accuracy, and compliance with recognized standards and protocols.

Thank you for visiting, and I hope this resource supports your learning or professional work in environmental testing and laboratory science.

📧 Contact: 21shambhu@gmail.com


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Oil and Grease Analysis in water and wastewater

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Introduction  Standard Operating Procedure (SOP) for Oil and Grease Analysis in Water and Wastewater based specifically on APHA 5520B (Standard Methods for the Examination of Water and Wastewater, 23rd Edition). This SOP follows the U.S. EPA's recommended format for SOPs (EPA QA/G-6) to ensure clarity, consistency, and compliance with environmental standards. APHA 5520B uses liquid-liquid extraction (LLE) with n-hexane followed by gravimetric analysis to determine oil and grease concentrations. 1. Purpose This SOP describes the procedures for analyzing oil and grease in water and wastewater samples using liquid-liquid extraction with n-hexane and gravimetric determination, as outlined in APHA 5520B. The method quantifies total oil and grease (n-hexane extractable material) in aqueous samples. 2. Scope and Applicability Scope: This SOP applies to the gravimetric determination of oil and grease in water and wastewater samples (e.g., surface water, industrial effluents, municipal wast...
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Demystifying Total Organic Carbon (TOC):

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Measurement of Dissolved Oxygen

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