Tips for Improving Collaboration between Field IHs and Laboratory Professionals
AN INTERVIEW WITH CINDY OSTROWSKI AND LAURA PARKER BY KAY BECHTOLD
In the early days of industrial hygiene, the industrial hygienist would collect air samples in the field, then perform the analysis. With the same person doing both, it was easier to consider both the sampling and analytical variables when evaluating the legitimacy of a sample result. As the science of analytical testing evolved and the IH industry matured, sampling and analysis became separate, specialized job functions. Today, field industrial hygienists develop the sampling strategies, collect the samples, and evaluate the results, while laboratory specialists perform the analysis—generally with limited involvement in the sampling process or knowledge of the original field environment. This specialization can lead to important variables being missed, which can severely affect the legitimacy of a sample result.
Field practitioners and laboratory specialists make their work look too easy to outsiders, say industrial hygiene consultant and AIHA Vice President Cindy Ostrowski, CIH, and Laura Parker, HSE laboratory service manager with Bureau Veritas North America, Inc. Laboratory specialists do not see the advance research conducted by field specialists to develop effective sampling strategies; therefore, hanging pumps in the field appears easy. On the other hand, the chemistry expertise required for producing valid exposure data is hidden when published methods show 10 simple steps to the correct result. Field practitioners are often not aware of the complex quality control statistics, instrument calibration and maintenance, and accreditation requirements necessary for defensible data. Ostrowski and Parker spoke with
The Synergistabout the need for communication to bridge the gap between the field practitioner and the laboratory personnel.
THE SYNERGIST (TS):
Why is it important to choose a laboratory accredited by AIHA-LAP?
LAURA PARKER (LP):Although accreditation doesn’t guarantee good data, it indicates that the laboratory’s quality system and technical expertise have been evaluated by an outside, independent third party. An assessment for accreditation includes an on-site visit at the lab facility, personnel interviews, and a review of the procedures and quality assurance that the lab uses to generate reproducible and defensible results.
CINDY OSTROWSKI (CO
Accreditation is important when survey results are questioned either by employers, unions, workers’ compensation claims, or worse, lawyers. Use of an accredited lab provides more credence to the sample results. As practitioners, we strive to monitor chemical exposures based on sound sampling strategies, calibrated equipment and instruments, and proper sampling methods. We understand that the results depend upon the use of correct analytical methods and practices to obtain defensible data to protect worker health.
Accreditation from AIHA-LAP also demonstrates compliance with the international standard for testing laboratories, ISO/IEC 17025:2005, and additional AIHA-LAP requirements. AIHA-LAP assesses labs against this standard along with other technical requirements, specific to the type of testing—industrial hygiene, environmental lead, environmental microbiology, food, and unique scopes. It’s important to note that accreditation includes specific Scopes of Accreditation and Fields of Testing, or FOTs, so accreditation is not a “yes” or “no” question. Therefore, clients have to dig deeper into these accreditation aspects with their laboratory service provider. For example, a lab accredited to analyze asbestos samples might not have been assessed to analyze solvents using a gas chromatograph. Therefore, an organic solvent sample, such as toluene, would not be covered by the lab’s accreditation.
To be honest, I wasn’t familiar with the specifics of FOTs until I became the AIHA Board liaison to AIHA-LAP. As Laura indicated, laboratories must be accredited for analyses using certain detector types or technologies and specific methods. Different analytical techniques are required for metals, organics, and even fungal or bacteria. As a field practitioner, you need to confirm your lab is accredited for the FOTs you need for your exposure assessment. A reputable laboratory must alert you if they are not accredited for specific methods, which are linked to analytes or contaminants of interest.
at are the practitioner’s responsibilities in this partnership?
CO:As a field practitioner, I’m responsible for developing a sampling strategy to evaluate employee exposures to airborne contaminants. I need to determine potential exposures based on operations, job tasks, safety data sheets, occupational exposure limits, engineering and administrative controls, and personal protective equipment, to develop the sampling strategy and conduct the exposure assessment. Based on this information, I need to communicate with the lab to determine which contaminants have published sampling and analytical methods.
LP:Some customers check the published methods to find a reporting limit or limit of quantitation, to see if they can achieve the necessary sensitivity for a particular exposure sample. It’s extremely important that the customer contact the lab for the lab’s specific reporting limit for a particular contaminant. Reporting limits will vary between labs, since each laboratory has its own standard operating procedures and instrumentation.
Field practitioners are often not aware of the
complex quality control statistics, instrument calibration and maintenance, and accreditation requirementsnecessary for defensible data.
After confirming the laboratory is accredited appropriately, what else do you expect from them?
:I always speak with my laboratory’s technical service representative to confirm the sampling parameters, such as sampling media, flow rates, volumes, and reporting limits. This information ensures your samples will be collected in a way to match the validated procedure. The laboratory will also inform you about any special handling requirements, such as collecting samples on open-face filters, desorption in the field, protection from light, and expiration dates. Obviously, the importance of this guidance is to avoid the need to repeat the sampling. Some operations being investigated have limited production schedules or unique job tasks that cannot be recreated at a later date.
can an accredited laboratory help the field practitioner?
LP:Laboratories provide method options and sampling parameters, as Cindy said. The lab also has a responsibility to ask the right questions, and that means we have to be attuned to the customer’s level of experience and sampling situation. For example, if somebody casually asks about beryllium, the lab representative should ask if the source could be beryllium oxide. If that detail is missed, a method that is not applicable for beryllium oxide would create an artificially low sample result, with the potential for an unrecognized beryllium exposure. When multiple methods are available, we
shouldwalk them through a decision process, using questions and conversation, to help them make the best choice.
We try to guide people toward a validated method, like a method published by NIOSH or OSHA, since the agencies have done the method validation and retained backup data. But if a published method isn’t available and all we can offer is a partially validated method, we have to make sure the client understands any limitations in defensibility.
Lab representatives also have to understand basic challenges in the field. A chemist may not know how cumbersome it is to wear pumps. Advising the field practitioner to collect contaminants on different media that would require multiple pumps is unacceptable to the employee being monitored. The lab needs to optimize the combination of contaminants collected using one pump.As a concept, the chain of custody, or COC, is a chronological documentation of the sample handling, starting with the field notes and continuing with the laboratory request form, package tracking number, and storage in the lab. COC is also the term often used in the lab industry to reference a Laboratory Service Request Form, which is a significant part of the COC trail. When filled out properly, the COC form documents the life of a sample set, starting with the collection date. It also serves as a contract for the sample batch, and it’s a great vehicle to communicate field information to the lab. It contains the client’s official instructions, listing the samples that were sent and the tests for each one. The field practitioner can note any variables that might affect the analysis. For example, when sampling hexavalent chromium, the lab’s preparation procedure and holding times change if a sample was collected from a welding operation, instead of a spray-painting process. Therefore, documenting the sample source on the COC is useful. The field practitioner can also note possible chemical interferences, environmental conditions, or sampling anomalies that could affect the results. Overall, misunderstandings are greatly reduced when the field practitioner provides details in the COC.
at else needs to be communicated between the field and laboratory specialists?
LP:We recommend that rush requests be scheduled in advance of shipping samples. Telling the lab which tests are needed and the approximate number of samples helps the lab start budgeting resources, such as trained personnel and instrument time, before the samples reach their door. This ensures a rapid turnaround.
There are numerous things to communicate to ensure sample integrity is preserved after collection. For example, do samples need to be kept cold versus ambient temperature? In the summer, you wouldn’t want samples that can be affected by high temperature and humidity to be sitting on a truck for a couple days. In this situation, or if samples need to be kept cold, shipping overnight would be better than shipping by ground. You also have to be careful to avoid cross-contamination between samples. If you’re sending impinger solutions or bulk samples, you need to ensure these samples don’t accidently contaminate your other samples. Your laboratory should provide instructions on the best way to submit samples. It is strongly encouraged that you use a service that assigns a tracking number.
LP:The tracking number is part of your chain of custody. It helps to document the sample’s journey.
is a chain of custody?
CO:The COC is also helpful if you ever get into a legal situation because it shows the date that samples were collected and the date they reached the lab. The lab is also required to document if there were any unacceptable conditions when the samples were received. If for some reason there’s any legal course of action taken regarding a particular field visit or that survey, you can document that your samples were handled correctly after they were collected and when they arrived at the lab. You get a history of the sample’s life, so to speak.
We all have to remember that
there is a worker who has a health and safety issue at the end of each sample,and that has to remain our primary focus.
lab results are reported, what do the numbers mean?
The laboratory only analyzes the samples and reports the results. It’s the practitioner’s responsibility to interpret results.
And that’s the expertise that some laboratory personnel don’t appreciate. Interpretation of results requires specialized knowledge. They might think that practitioners look at an OEL and decide if the result is over, or not. It’s not that simple.
CO:And sometimes, your results will have unexpected numbers.
o you mean by “unexpected numbers”?
CO:Let’s say of all the samples, one has a positive result for a contaminant while all the other samples are none detected. So, I will contact the laboratory to confirm the positive result. Once the laboratory confirms that data, it’s my responsibility to follow up with the employer or employees to determine if something occurred that was out of the ordinary or not expected.
LP:For example, we had a client who called to question a high silica result, and we verified the data was correct. The client interviewed the employee who wore the sampling pump. The employee shared that he fell into a sand pile while wearing the pump. He thought the five-second rule applied and just brushed off everything. He didn’t realize that in those few seconds, with the pump running, that cassette was a little vacuum for sand particles. It severely skewed the sample result.
:Remember, it’s best to confirm any unusual or questionable data. You don’t want to report results to an employer that misrepresent employee exposures to contaminants. It could cause an employer to implement controls unnecessarily, or worse, not protect employees. Communication between the lab and the practitioner is vital, so you can feel comfortable that the data being reported is reliable.
LP:A lab needs to cheerfully check data if asked to do so, remembering that important decisions will be based on those data points. If the data is confirmed, then we have to discuss the chemistry with the field practitioner. There could be a potential interference or a limitation of the analytical technique, for example. Once those possibilities have been exhausted, the practitioner should go back and review their field situation.
How would you sum up the importance of collaboration between the field practitioner and the AIHA-LAP-accredited laboratory?
LP:Both the field practitioner and laboratory have to see the other’s perspective to obtain the best data possible. Collaboration on selecting the appropriate sampling and analytical methods, potential environmental interferences, and shipping and handling takes time. Sometimes that’s difficult in light of the demands to do everything now. We all have to remember that there is a worker who has a health and safety issue at the end of each sample, and that has to remain our primary focus.
Field work is more than hanging pumps and lab analysis is more than pushing a few buttons. The sample results are only as good as my collection process in the field and the quality of the data produced by the laboratory. Both sides have to respect the expertise of the other. As a field practitioner, I have to have a strong relationship with my lab. Together, we collaborate to protect worker health.
TROWSKI, MS, CIH, FAIHA,is principal at CAO Consulting, LLC in Rochester Hills, Mich. She can be reached at (248) 421-4024 or
LAURA PARKERis HSE laboratory service manager with Bureau Veritas North America, Inc. in Novi, Mich. She can be reached at (248) 344-2649 or
KAY BECHTOLDis assistant editor of
The Synergist. She can be reached at (703) 846-0737 or
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Although the print version of The Synergist indicated The IAQ Investigator's Guide, 3rd edition, was already published, it isn't quite ready yet. We will be sure to let readers know when the Guide is available for purchase in the AIHA Marketplace.
My apologies for the error.
- Ed Rutkowski, Synergist editor
Disadvantages of being unacclimatized:
- Readily show signs of heat stress when exposed to hot environments.
- Difficulty replacing all of the water lost in sweat.
- Failure to replace the water lost will slow or prevent acclimatization.
- Increased sweating efficiency (earlier onset of sweating, greater sweat production, and reduced electrolyte loss in sweat).
- Stabilization of the circulation.
- Work is performed with lower core temperature and heart rate.
- Increased skin blood flow at a given core temperature.
- Gradually increase exposure time in hot environmental conditions over a period of 7 to 14 days.
- For new workers, the schedule should be no more than 20% of the usual duration of work in the hot environment on day 1 and a no more than 20% increase on each additional day.
- For workers who have had previous experience with the job, the acclimatization regimen should be no more than 50% of the usual duration of work in the hot environment on day 1, 60% on day 2, 80% on day 3, and 100% on day 4.
- The time required for non–physically fit individuals to develop acclimatization is about 50% greater than for the physically fit.
- Relative to the initial level of physical fitness and the total heat stress experienced by the individual.
- Can be maintained for a few days of non-heat exposure.
- Absence from work in the heat for a week or more results in a significant loss in the beneficial adaptations leading to an increase likelihood of acute dehydration, illness, or fatigue.
- Can be regained in 2 to 3 days upon return to a hot job.
- Appears to be better maintained by those who are physically fit.
- Seasonal shifts in temperatures may result in difficulties.
- Working in hot, humid environments provides adaptive benefits that also apply in hot, desert environments, and vice versa.
- Air conditioning will not affect acclimatization.
Acclimatization in Workers