What does ISO/IEC 17025 ensure?
Technical competence and accuracy of lab results.
What is a control sample used for in quality control?
To validate test accuracy with known analyte concentration.
Why repeat a sample if test results are abnormal?
To verify the original result by retesting the same sample.
What is the purpose of a spiked sample?
To assess method recovery and matrix effects by adding analyte.
Define Quality Management in labs (ISO definition).
Planned actions to ensure product/process meets quality requirements.
Which component of quality management is reactive?
Quality Control (QC).
What quality control tool detects shifts or changes over time?
Control chart.
Which law regulates chemical precursors in illegal drug manufacturing?
RA 9165.
Which law governs flammable chemical storage in labs?
RA 9514 (Fire Code of the Philippines).
Where should a lab fume hood be located?
Away from air supply vents and high-traffic areas.
Name a good practice when using a fume hood.
Keep sash at recommended height and work 6 inches inside hood.
Recommended minimum eye flush time when chemical is unknown?
15 minutes.
Which fire extinguisher class is for electrical fires?
Class C, often carbon dioxide extinguisher.
Main purpose of a Chemical Hygiene Plan?
Ensure safe chemical handling and regulatory compliance.
Why is PPE alone insufficient for lab safety?
PPE is last line of defense; systemic controls are needed.
Appropriate lab coat for working with flammable solvents?
Flame-resistant lab coat.
Best gloves for handling concentrated acids?
Neoprene gloves with chemical-resistant lab coat.
Which respirator is suitable for low-hazard airborne particles?
N95 respirator.
Goggles to avoid with volatile chemicals?
Direct vent goggles.
What hazard does skull and crossbones symbol indicate?
Acute toxicity (fatal or toxic).
Flame symbol in GHS system indicates?
Flammable substances.
Document providing chemical hazard info and precautions?
Safety Data Sheet (SDS).
Three elements of fire triangle?
Heat, fuel, oxygen.
Difference between QA and QC?
QA is proactive process control; QC is reactive product check.
