11. The ACGIH TLV-TWA for ethyl bromide is 5 ppm.a. What does that correspond to in mg/m³? (assume NTP)b. Using the exposure measurements below (taken during a single shift), determine theworker's TWA exposure. Was the TLV-TWA exceeded?Exp. Conc. Exp. Duration(ppm)1.32.74.815.912.49.3(hours)0.61.82.50.51.11.5c. If a short-term increase in demand results in longer work hours/weeks, what shouldthe adjusted TLV-TWA be (based on the ACGIH value above)?Assume the new shifts are 11 hrs per day and 6 days per week(make your recommendation using the more-conservative estimate).

Answered: The ACGIH TLV-TWA for ethyl bromide is…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

11. The ACGIH TLV-TWA for ethyl bromide is 5 ppm.
a. What does that correspond to in mg/m³? (assume NTP)
b. Using the exposure measurements below (taken during a single shift), determine the
worker's TWA exposure. Was the TLV-TWA exceeded?
Exp. Conc. Exp. Duration
(ppm)
1.3
2.7
4.8
15.9
12.4
9.3
(hours)
0.6
1.8
2.5
0.5
1.1
1.5
c. If a short-term increase in demand results in longer work hours/weeks, what should
the adjusted TLV-TWA be (based on the ACGIH value above)?
Assume the new shifts are 11 hrs per day and 6 days per week
(make your recommendation using the more-conservative estimate).

Expert Solution

Step 1

Introduction

The threshold limit value (TLV) is considered to be a level to which a worker can be exposed per shift in the worktime without adverse effects . ACGIH publishes TLV guidelines and indices for use by industrial hygienists in making decisions regarding safe levels of exposure to various chemical and physical agents found in the workplace. TWA -TLV stands for Time Weighted Average of Threshold Limit Value, and quantifies the average level of exposure of a worker over a 8 hour shift , usually calculated as a weighted average of 6 day weekly recordings.