What is the TLV-TWA for hydrogen sulphide over a period of 8 hours ?
Direct Answer
Option A: 5 ppm
The Threshold Limit Value – Time Weighted Average (TLV-TWA) for hydrogen sulphide (H2S) over an 8-hour period is 5 ppm. This is the maximum average concentration workers can be exposed to without adverse health effects, a critical safety parameter highlighted in ISGOTT and chemical safety data sheets.
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Detailed Explanation & Context
The Threshold Limit Value – Time Weighted Average (TLV-TWA) for hydrogen sulphide (H2S) over an 8-hour period is 5 ppm. This is the maximum average concentration workers can be exposed to without adverse health effects, a critical safety parameter highlighted in ISGOTT and chemical safety data sheets.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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