Physical Sciences & Engineering
Chemistry
Synthetic, analytical, physical, and organic chemistry research. Among the most equipment- and consumable-intensive fields, with distinctive requirements around chemical hygiene planning, hazard communication, waste segregation, analytical instrument calibration, and the reporting conventions of the chemical literature (characterisation data, crystallographic information files).
23 pages across 5 topic areas
Laboratory Compliance & Quality
- OSHA-Reportable Laboratory Injuries: The 8-Hour and 24-Hour Clocks, and What Recordable Means Instead
Reporting a laboratory injury to OSHA and recording it on the 300 Log are two different duties with two different triggers. This guide separates 29 CF…
- ICH Q2(R2) Analytical Procedure Validation: Which Tests Apply, What Changed from Q2(R1), and How It Pairs with Q14
ICH Q2(R2) and ICH Q14 were adopted at Step 4 together on 1 November 2023. This guide sets out the Q2(R2) Table 1 test-selection matrix by measured qu…
- GHS Classification of Chemicals: How Hazard Classes and Categories Get Assigned to a Mixture
A worked GHS classification of a mixture under 29 CFR 1910.1200 Appendices A and B: which ingredients count, the acute toxicity additivity formula, sk…
- Permissible Exposure Limits vs TLVs and RELs: Which Number Governs a Laboratory Chemical
The OSHA PEL is the only enforceable airborne limit, and for most laboratory chemicals it is the 1971 value derived from the 1968 ACGIH TLVs. This pag…
- Written Hazard Communication Program for a Laboratory: Who Actually Owes One, and How It Nests Inside the Chemical Hygiene Plan
A laboratory under 29 CFR 1910.1450 owes a Chemical Hygiene Plan, not a written hazard communication program — but the stockroom, machine shop and pil…
- Lab Waste Disposal: RCRA Streams, Generator Status, and Disposal Routes
A research lab generates several legally distinct waste streams — RCRA hazardous chemicals, medical/biohazardous waste, sharps, radiological waste, an…
- Calibration Certificates and Metrological Traceability: What “NIST-Traceable” Actually Means
What a compliant calibration certificate must contain, what metrological traceability (VIM) actually requires, why “NIST-traceable” is widely misused,…
- Laboratory Design for Compliance and Safety
A practical guide to the compliance and safety dimension of laboratory design: containment zoning, ventilation and pressure relationships, fume hood a…
- Type I, II and III Laboratory Water: Grades, Standards and Uses Compared
ASTM D1193, ISO 3696 and CLSI GP40 define laboratory water grades (Type I/II/III, Grade 1/2/3, CLRW) with overlapping but non-identical resistivity, T…
- Eyewash Station and Safety Shower Requirements: ANSI Z358.1 and OSHA
ANSI/ISEA Z358.1 and OSHA 1910.151(c) requirements for eyewash stations and safety showers: 10-second/55-foot travel distance, 15-minute flush, tepid …
- ISO/IEC 17025: What It Actually Accredits and How It Differs from ISO 9001
ISO/IEC 17025:2017 accredits a laboratory’s technical competence for a defined scope of tests or calibrations — it does not certify the organization a…
Laboratory Equipment & Instrumentation
- High-Resolution Mass Spectrometry: How Much Resolving Power and Mass Accuracy You Actually Need
Resolving power and mass accuracy specified by job rather than by datasheet: the resolving power needed to separate named isobaric pairs, how many can…
- SPE Cartridge Selection and Method Optimization: Sorbent Choice and the Wash-Step Trade-Off
A method-development guide to solid phase extraction: choosing a sorbent from analyte pKa and log D, the strong-versus-weak exchanger rule, and how to…
- ATR-FTIR vs Transmission FTIR: Penetration Depth, Crystal Choice, and Spectral Distortion
A sampling-mode selection guide for mid-IR: the penetration-depth equation with its variables and assumptions, crystal choice by sample chemistry, and…
- Electrospray Ionization: Source Parameters and How to Tune Them
A source-parameter tuning procedure for electrospray ionization: what each of the six ESI controls physically does, how Waters, Agilent, SCIEX, Thermo…
- Multiple Reaction Monitoring: Building and Optimizing MRM Transitions
A working guide to MRM method development on a triple quadrupole: choosing precursors and product ions, optimising collision energy, and budgeting dwe…
- Types of Laboratory Glassware: Volumetric vs. General-Purpose, Explained
A selection-and-accuracy reference for laboratory glassware: the volumetric vs. general-purpose distinction, TC/TD markings, Class A vs. Class B toler…
- Pipette Tips: Selection Guide by Application
How to choose pipette tips by application: filter/barrier vs. standard, low-retention vs. standard, sterile vs. autoclavable, and rack vs. bulk format…
- Biosafety Cabinet vs. Fume Hood vs. Laminar Flow Hood: Which Do You Need?
Laboratory Operations & Safety
- Hazard Communication Standard (29 CFR 1910.1200) in the Research Laboratory: What Actually Applies
OSHA’s Hazard Communication Standard applies to laboratories only in part. 29 CFR 1910.1200(b)(3) imposes exactly four duties; the written program, wo…
- Choosing a Chemical Inventory Management System for Your Lab
A buying guide to chemical inventory management software: what it does, why spreadsheets fail at audit, the regulatory drivers, how it differs from a …
Research Methods & Statistics
- What Is Biochemistry? Research Areas, Funding, and Career Paths
What biochemistry studies, its major subfields, who funds the research (NIH, NSF), core lab methods, and typical career and PhD training paths.…
Research Tools & Software
- What Is a LIMS? Laboratory Information Management System Explained
A Laboratory Information Management System (LIMS) tracks lab samples, workflows, and results with a full audit trail. This guide explains what a LIMS …
