Unit Lesson

An important part of the industrial hygienist’s job is to recognize hazards in the workplace. Occupational

hazards can be divided into three basic categories: chemical, biological, and physical. We will be studying

chemical and biological hazards during this unit. Recognizing chemical hazards requires the industrial

hygienist to have at least a basic understanding of chemistry and biology, including the sub-science

of microbiology.

Chemical hazards are typically divided into two categories based on their chemical state. The two categories

are vapors/gases and aerosols. In the occupational setting, it is more common that the terms particle or

particulate are used. It is fairly easy to understand the differences between gases/vapors and aerosols. What

may be more difficult is to understand the difference between a gas and a vapor.

The difference between a gas and a vapor depends on the state of the chemical at normal (sometimes called

standard) temperature and pressure (NTP or STP). A gas is in the gaseous state at NTP, while a vapor is in

the liquid state at NTP with some vapors being produced. The concentration of the vapors being produced

depends on the vapor pressure of the chemical. Gases have vapor pressures that are high enough that they

do not exist as a liquid at NTP. The higher the vapor pressure is for a chemical, the more likely a vapor will be

produced. One important thing to remember is that vapor pressure is temperature dependent. As the

temperature increases, the vapor pressure of a chemical will also increase, increasing the volatility of the

compound. This can be very important for an industrial hygienist in recognizing chemical hazards. Thus, if the

UNIT IV STUDY GUIDE

Recognition of Chemical and Biological Hazards

Commonly Present in Industrial Settings

MOS 6301, Advanced Industrial Hygiene 2

UNIT x STUDY GUIDE

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industrial hygienist knows that a certain chemical with a fairly low vapor pressure is being used in a process in

which it will be heated up, there may be a significant increase in exposure levels that must be dealt with.

Another important chemical property that the industrial hygienist must consider is the vapor density.

Chemicals with vapor densities greater than one (heavier than air) will settle to lower areas when there are no

outside forces like wind or ventilation working on them. Chemicals with vapor densities lower than one tend to

rise up. If a spill or gas release occurs at a facility, the industrial hygienist should consider the vapor density to

account for concentrations of the chemical that may collect in low lying areas near the spill. Not taking this

into account has resulted in exposure to individuals entering low lying areas, such as pits, after a spill cleanup

and suffering harm or death due to the accumulation of vapors and gases.

Aerosols have chemical properties that make their recognition somewhat different than gases and vapors.

There are several general categories of aerosols, dusts, mists, fogs, fibers, smokes, and fumes. The

differences are based on the types of aerosols that are present in the air. Dusts and fumes are solid aerosols

in the air. Mists and fogs are liquid particles in the air. Smokes are mixtures of solid and liquid aerosols in the

air. Fibers are solid aerosols in the air with a specific length-to-width ratio.

Fumes are aerosols that are sometimes misunderstood by both health and safety personnel and the lay

person. The term fume has come to be used synonymously with the terms vapor and gas. It is important for

the industrial hygienist to understand the difference among these terms. A fume is generated when a solid

material is vaporized. The vapor is not stable in the air at the temperatures that are present, so very small

particles are produced. The most commonly encountered fumes in an occupational setting are welding fumes.

Understanding the difference between a fume, a gas, and a vapor is very important when determining control

methods, which we will explore in a later unit.

Another important difference between aerosols and vapors/gases is the concept we talked about involving

vapor pressure and vapor density. Vapor pressure and vapor density are not typically the controlling factors

regarding how aerosols react in the workplace. Particle size is very important in determining how an aerosol

will interact with the human body and how long an aerosol may remain airborne. In general, smaller particles

will be deposited in lower regions of the respiratory system than larger particles. This can have a great effect

on the toxicity of the aerosol. An example of this is nasopharyngeal cancer caused by exposure to some

hardwood dusts. The particles are typically too large to enter the lower regions of the lung and are deposited

in the nasopharyngeal region where the harm occurs. Understanding aerosol size can also be important in

determining control methods.

Passive diffusion can also be important for the deposition of particles if the particles are submicron in size. A

random motion is imparted to the particles by the impact of gas molecules in the lungs. Also, diffusion is an

important deposition mechanism in small airways and alveoli for particles below about 0.5 µm in size. The site

of deposition affects the severity of tissue damage, the degree of absorption, the clearance mechanisms

available, and thus, the ultimate removal of the particles. This is one factor in the toxicity of asbestos fibers,

as smaller fibers are the most active.

Biological diseases are not typically as prevalent as chemical exposures in most industrial settings. However,

in some occupational settings, biological exposures are extremely important. For example, in a hospital

setting, the industrial hygienist needs to be able to identify several biological hazards, including bacteria like

Mycobacterium tuberculosis and fungi like Aspergillus fumigatus. The industrial hygienist will also need to be

able to identify viruses such as the human immunodeficiency virus (HIV), algae, and protozoa. Controlling

biological exposures typically takes some specialty training beyond what the average industrial hygienist

requires. A better understanding of microbiology, bacteriology, and mycology are examples of additional

sciences that might be studied. The Occupational Safety and Health Administration (OSHA) has published the

Bloodborne Pathogen standard specifically to control exposures to biological hazards.

Finally, industrial hygienists must also have a good understanding of routes of exposure for chemical and

biological hazards. The dermal route of exposure presents a unique exposure that is sometimes overlooked.

Understanding which compounds are more likely to cause harm through dermal exposure and understanding

the conditions that may be present that could increase exposure through the dermal route can be very

important. An example would be exposure to hydrogen fluoride (HF). HF will initially cause burns to the skin

like other strong acids. However, HF can be absorbed through the skin. HF has a great affinity for calcium

and will bind with calcium in the blood and bones, sometimes causing a severe condition called

hypocalcemia. In places where dermal contact with HF may occur, the industrial hygienist will oftentimes 

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place containers of calcium gluconate gel, which can be applied immediately after dermal exposure to bond

with the HF, preventing further harm to the individual.

Unit IV Journal

To post your Journal, click on the link above and respond to the Journal question within the “write submission” textbox. For detailed information on how to submit your assignment, go to the Submission Instructions page.

#1

Think about your current or former place of employment. What are some chemical and/or biological hazards that you might have come in contact with there? If you had been or were currently an industrial hygienist or safety officer at the organization in question, how would go about ensuring that the health effects of those hazards were properly mitigated? 

Your journal entry must be at least 200 words. No references or citations are necessary.

#2

Unit IVEssay

After reading the Unit IV Lesson and your assigned readings, choose three substances that were discussed. One

substance must be a gas/vapor hazard, one must be an aerosol hazard, and one must be a biological hazard.

Write a minimum of one page for each hazard you choose (a minimum of three pages total), which summarizes the

following information:

Explain whether the substance is a chemical or biological hazard, and explain how you determined that.

Explain the key chemical properties (vapor pressure, vapor density, molecular weight, relative size) as applicable, and

describe how these properties affect the different routes of exposure. Based on the chemical properties, how would you

identify which exposure route is the most important?

Analyze how the substance could enter the body through the dermal route, and discuss why the dermal route would or

would not be important.

Describe the region of the respiratory system where deposition would be expected (only for the aerosol hazard).

You should use your textbook and resources from the CSU Online Library to obtain information for this assignment. You

must use proper APA formatting for all references that you use. The title page and reference page do not count toward

meeting the required page count.

 Delay in Physical Security in the IT sector.

  

•The purpose of the research paper is to associate controls (administrative, technical, and physical) with your assigned physical security goal.

•Some items that need to be addressed are:

–Associated Threats

–Policies

–Procedures

–Plans

–Guidelines and standards

–Appropriate controls

–Issues and concerns for different industries

–Business continuity and risk mitigation

–Budgetary concerns

Note:

  Above Is my complete question but I need Just Introduction and Conclusion for the above question 

External standards, Regulations and Initiatives.

 

Requirements:

 

1. Write a 2 page essay describing how external standards, regulations, and initiatives  impact the health information profession and HIM staff. You may want to consider the following questions as you are writing:
   • How do regulations and initiatives help the profession?
   • How might they give us new challenges?
   • How do we learn about them and understand what we need to do to respond?
   • Do they help to create new jobs? Do they eliminate jobs? Do they change jobs?
   • How does an HIM manager go about applying these to processes within the HIM department?
2. Cite supporting materials from scholarly resources such as journals.
3. Be sure to write a formal paper with an introduction, supporting paragraphs, and a conclusion.

 

Your paper should:

 

• be 2 pages in length.
• properly cite research sources.
• be free of spelling and grammar errors.

 

Be sure to write a formal paper with an introduction, supporting paragraphs, and a conclusion. Format your essay in Arial 10 or 12 font and double space with APA format.

 

To Prepare:

• Using this week’s Learning Resources and at least two resources you have located during work on your Environmental Scan blog, identify at least five scholars and/or practitioners in the evaluation field. Pay particular attention to leaders that have conducted work in areas of professional interest to you.
• Use the Walden Library and the Internet to locate detailed and in-depth information about the individuals you identified. It may be useful to use one or more of the following research strategies:
  • Pinball effect – This means that you should follow a trail of information wherever it leads you, clicking on hyperlinks or following leads in the library catalog to branch off to related topics. In education, this technique is rarely used because of the high emphasis and value placed on directed focus. In graduate study, the pinball effect may be the smartest thing to do—seeking connections across domains can lead to new constructions of knowledge. (The effect is named for the action of unexpected pathways that you create with a pinball machine game.)
  • Academic Legacy/Generationality – Trace the academic genealogy, or relationship between scholars that have mentored one another, within a particular area of evaluation.
  • Schools or Branches of Thought – You may find resources that categorize influential scholars and practitioners based on their theoretical or philosophical perspectives. Explore how these orientations affect the practice of evaluation.

By Day 3

Post detailed professional biographical information about at least five influential scholars and practitioners in the field of evaluation (either living or deceased). Include important terms, processes, strategies, or techniques associated with each person and the legacy that their contributions left on the field. Your information should go much deeper than encyclopedic-level information available in sources such as Wikipedia. Also, explain any global implications of the leaders’ work

The ability to deal with the unexpected influx of patients is a key challenge in a disaster scenario. In order to be truly prepared, a healthcare organization must be ready to deal with the increased number of patients. In some cases, the military is also available to assist in dealing with the influx of patients. The military is highly trained and has a vast number of resources that most citizens are not aware of. They are equipped and have the skill-set and the mentality to respond efficiently to disasters.

Using the South University Online library or the Internet, search some articles on civilian response to disaster situations and military disaster response process. Based on your research, answer the following questions:

• Would you request the military to assist you in dealing with the influx of patients at the hospital? Why or why not? If yes, how would you use the military, and if no, what would you and your staff do to deal with the influx of patients?
• How would you go about garnering the assistance of the military if the situation called for it?

Following Hurricane Katrina, a hospital needed to be evacuated because of the rising water. The evacuation was conducted in stages as the patients were moved to other safe hospitals in batches using a helicopter, an ambulance, and a boat. After four days, the evacuation was complete, thanks to a coordinated effort with other agencies such as the Louisiana Department of Wildlife and Fisheries. In regard to the given scenario, answer the following questions:

• What would have happened if the hospital had not been assisted by other agencies? Why?
• How would you have addressed the situation? What would you include in your disaster plan to handle such a situation? How?