Laboratory Safety and Regulatory Compliance
Laboratory Safety and Regulatory Compliance
This domain tests the daily decisions an LC analyst makes with solvents, waste, and records: which operations need a fume hood, how mobile phase waste is segregated, and what makes an electronic result defensible in an audit. Items are usually scenario-based - a spilled buffer, a nearly full waste carboy, a re-integrated chromatogram - and the correct answer must satisfy both the regulation and the chromatography.
Chemical hazards and engineering controls
- Acetonitrile (ACN), methanol, and trifluoroacetic acid dominate LC risk. ACN is highly flammable with a flash point near ambient and is toxic; prepare mobile phases and collect waste in a fume hood.
- Glove choice is chemical-specific: check SDS Section 8. ACN permeates thin nitrile quickly; butyl or laminate is often specified. Double-gloving is no substitute for the right polymer.
- A pinhole leak at a high-pressure fitting makes an invisible jet that can inject solvent under the skin. Depressurize before tightening any fitting.
- Deuterium lamps are pressurized and can shatter; handle with eye protection and respect lamp hour limits.
Waste segregation
- Keep halogenated waste separate from non-halogenated, and aqueous buffer waste separate from ignitable organic waste; never combine streams without EHS approval.
- Label every container with contents, hazard, and date; leave headspace; close caps.
Records and validation
Under 21 CFR Part 11, raw data are retained, audit trails are on, user IDs are unique, and any change to integration or processing carries a reason and authorization. Method validation follows ICH Q2(R2); system suitability follows USP <621>.
Worked example
An analyst re-integrates a failing batch, raising the peak threshold so an impurity falls below the reporting limit. Not compliant. Reprocessing is allowed only under a written SOP with pre-approved parameters; the change must preserve the original result, record who changed what and why in the audit trail, and be reviewed. Tightening a threshold to hide a peak is data manipulation, not integration.
Traps
Treating 'well ventilated' as a fume hood; pouring aqueous buffer into the organic waste; calling ACN non-hazardous because it is water-miscible; disabling the audit trail during development.