CSP-11 CSP-11 D6.03 · Domain 6 · Occupational Health and Applied Science · 10%
Toxicology
At a drilling-rig maintenance bay, a monitor shows 50 ppm carbon monoxide while a propane forklift is being serviced. The report copies the result as 50 mg/m³, and a slide relabels a smaller advisory value as the OSHA PEL. As the CSP, separate three questions: what the gas-unit conversion actually is, which limit has legal authority, and what the sample can say about worker dose over time.
Updated . Independent CSP-11 practice. Not BCSP-endorsed. No pass guarantee.
Decision rule
Dose, route, and potency decide toxicity. A concentration is not automatically a risk.
ppm and mg/m3 convert at stated conditions.
In 20 seconds
- Dose, route, and potency decide toxicity.
- A concentration is not automatically a risk.
- Distinguish acute and chronic, local and systemic effects.
- Separate legal OSHA PELs from advisory TLVs and RELs.
How to apply Toxicology
THEORY: BELs and TLVs are guidance. LD50 is not a workplace limit. Target organs explain medical surveillance. CALC: mg/m3 ≈ ppm x MW / 24.45 at 25 °C, 1 atm. CO 50 ppm, MW 28 → 57.3. TI-30XS: 50x28/24.45=. FIELD: Vendor cites LD50 to skip ventilation. Reject; control exposure. ASSESS: Calling BEI a PEL is the trap.
Worked case
Wrong first move: Quote LD50 and keep the open process. Correct move: Convert units if needed; control the source.
Why the rule holds
Related: 84, 99.
Same rule, different setting
Lab reports 50 ppm H2S-adjacent CO in a bay and someone “converts” it by calling it 50 mg/m³. Another slide calls a TLV the OSHA PEL because it is smaller. You are the CSP. The question is dose-response plus which number is law.
Lab reports 50 ppm CO in a garage and someone “converts” it by calling it 50 mg/m³. Another slide calls a TLV the OSHA PEL because it is smaller. You are the CSP. The question is dose-response plus which number is law.
Picture / model
Interpret a chemical result in the right order: identify agent, route, concentration, duration, and susceptible population; distinguish regulatory from advisory exposure criteria; then convert gas ppm and mg/m³ only under explicit temperature and pressure assumptions.
Exam traps
Original SafePath contrasts for Toxicology. These are study traps, not recalled BCSP items.
| Trap | Correct read |
|---|---|
| PEL | OSHA legal limit — citation basis |
| TLV / REL / WEEL | Advisory guidelines — not automatically law |
| TWA vs STEL vs C | 8-h average vs 15-min vs ceiling — different clocks |
| LD50 / LC50 | Animal lethality ranking — not a PEL |
| ppm vs mg/m³ | Need MW and 24.45 (25 °C) — not 1:1 |
Field move
A lower TLV is not the federal limit just because it was typed into the file.
Scenarios
Scenario 1 · Applied Scenario · CSP-11 D6.03
A chemical exposure citation file replaces a substance's applicable OSHA PEL with a lower ACGIH TLV and labels it 'federal limit.' What correction is needed?
Best action: Use the applicable OSHA limit for the legal determination and identify the TLV as an advisory or internal target.
Why: Evaluate the best response. The citation file replaces the applicable OSHA PEL with a lower advisory TLV and labels it the federal limit. Use the OSHA limit for the legal determination and identify the TLV as advisory or internal. This item does not quote the TLV booklet. The TLV automatically beco…
Scenario 2 · Applied Scenario · CSP-11 D6.03
At 25 °C and 1 atm, an air sample contains 50 ppm carbon monoxide. Using molecular weight 28 g/mol and molar volume 24.45 L/mol, what is the concentration?
Best action: About 57.3 mg/m³ from 50×28÷24.45.
Why: Evaluate the best response. At 25 °C and 1 atm, 50 ppm carbon monoxide with molecular weight 28 and molar volume 24.45 is 50 times 28 divided by 24.45, about 57.3 mg/m³. About 0.57 mg/m³. — 0.57 mg/m³ is low by about a factor of 100. About 1,400 mg/m³ because molar volume can be ignored. — 1,400 mg…
Scenario 3 · Applied Scenario · CSP-11 D6.03
At 25 °C and 1 atm, a hydrogen sulfide sample is 10 ppm. With molecular weight 34 g/mol and molar volume 24.45 L/mol, what is its mass concentration?
Best action: 13.9 mg/m³, approximately.
Why: Evaluate the best response. At 25 °C and 1 atm, 10 ppm hydrogen sulfide with molecular weight 34 and molar volume 24.45 is 10 times 34 divided by 24.45, about 13.9 mg/m³. 0.34 mg/m³, using only the molecular weight. — 0.34 mg/m³ uses only a fraction of the molecular weight and drops the ppm and the…
If the stem says this
| Stem signal | Best direction |
|---|---|
| identify exposure | Name chemical, route, concentration, duration, susceptible population and whether the effect is local or systemic. |
| select the criterion | Read the actual jurisdictional PEL and any advisory limits with matching TWA, STEL or ceiling basis. |
| convert gas units | At 25°C and 1 atm for an ideal gas, mg/m³ ≈ ppm × molecular weight / 24.45; document conditions. |
| control before comparison | A concentration calculation does not replace source investigation, ventilation and protection where exposure is occurring. |
Check before you leave
- ✓ Distinguish acute and chronic, local and systemic effects.
- ✓ Separate legal OSHA PELs from advisory TLVs and RELs.
- ✓ Convert an illustrative carbon monoxide ppm concentration to mass concentration.
- ✓ Avoid confusing animal lethality metrics with worker exposure limits.
- ✓ Concentration, dose and biological response are distinct.
- ✓ PEL is legal in its jurisdiction; TLV and REL are advisory.
Blueprint mapping
Toxicology is the SafePath study class for CSP-11 D6.03 inside CSP-11 Domain 6, Occupational Health and Applied Science (10%). This domain combines occupational hygiene with applied science: exposure assessment, public health, toxicology, ergonomics, chemistry, and physics.
SafePath uses the publicly posted CSP-11 outline as a study map. It does not reproduce official exam content, and it is not affiliated with or endorsed by BCSP or Pearson VUE.
Practice / flashcards / formulas
More classes in Occupational Health and Applied Science
Nearby lessons mapped to the same CSP-11 domain.
CSP-11 D6.03
Other classes on this task
Guides that use Toxicology
- CSP calculationsIncident rates, noise, ventilation, and unit checks
- Formula deskNamed expressions used in occupational-health items
- Manufacturing safety study guideExposure, noise, and process controls
- CSP-11 exam prep guideDomain weights, sample items, and a study sequence
- CSP-11 blueprint and weightsSeven published domains and the class map
Toxicology study questions
- What decision does the Toxicology class train?
- Dose, route, and potency decide toxicity. A concentration is not automatically a risk. This is independent SafePath CSP practice for CSP-11 D6.03. It is not an official BCSP item and it is not a pass guarantee.
- What exam trap shows up in Toxicology?
- A common miss treats this as sufficient: PEL The stronger read is: OSHA legal limit — citation basis
- How does Toxicology map to the CSP-11 blueprint?
- SafePath maps this class to CSP-11 D6.03 in Domain 6, Occupational Health and Applied Science (10% of the published blueprint). Use the public outline for study planning. SafePath is not affiliated with or endorsed by BCSP.
Verify
Verify: Confirm current certification requirements with BCSP and technical requirements with the cited authoritative standard.