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NANOSH Hunting for Nanoparticles. A Year in the Life of an Aerosol Scientist I.L. Tuinman. Layout. Project NANOSH: Nanoparticle Occupational Safety and Health Measurements on site: can we find and characterize a nanoparticle health hazards in workplace environments?

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nanosh hunting for nanoparticles

NANOSH Hunting for Nanoparticles

A Year in the Life of an Aerosol Scientist

I.L. Tuinman

layout
I.L. Tuinman Layout
  • Project NANOSH: Nanoparticle Occupational Safety and Health
  • Measurements on site: can we find and characterize a nanoparticle health hazards in workplace environments?
  • Filtration: how well are nanoparticles filtered by respiratory protection filters
nanosh nanoparticle occupational safety and health
I.L. Tuinman NANOSH Nanoparticle Occupational Safety and Health
  • Oberdorster and other authors published data showing nanoparticles can be more toxic than micron-sized particles
  • Some nanoparticles can even cross the brain barrier
  • Unintentional production of man-made nanoparticles was already high but increasingly nanoparticles are produced intentionally because of their improved properties and miniaturization of instruments
  • Maybe standard Personal Protective equipment does not provide proper protection
content nanosh project
I.L. TuinmanContent NANOSH-project
  • Characterization of nanoparticles (WP1)
  • Perform measurements to determine Workplace Exposure (WP2)
    • Design a proper protocol for such measurements
    • Interpret the data
  • Test respiratory filters or respirators against nanoparticles
  • Test toxicology of nanoparticles (not discussed here) in 3 WP: genotoxicity, pulmonary inflammation and the effect of particles on microcirculation
slide5

Total measurement equipment >100 kg, k€500 was transported in a small van from site to site

      • ELPI
      • SMPS
      • Condensation Particle Counters (Portacounts)
      • Personal sampler
      • NSAM/ LQ1/Aerotrak 9000for active surface area

I.L. Tuinman NANOSH

Occupational Hygiene: on site measurements

TEM photograph of fumed silica

collected with a personal sampler

slide6
I.L. Tuinman NANOSH

Electrical Low Pressure Impactor, ELPI

+ Large size range (30 nm-10 µm)

+ Fast: high time resolution combined with some size resolution (12 size classes)

+ Large concentration range

+ Sample analysis afterwards possible

Measurement of exposure to ultrafine/nanoparticles

slide7
I.L. Tuinman NANOSH

Typical Result ELPI emptying bags with dust particles into a filling system

slide8
I.L. Tuinman

I.L. Tuinman NANOSH

Typical Result CPC emptying bags with dust particles into a filling system

slide9
I.L. Tuinman NANOSH

Why filter tests with Nanoparticles?

Authors like Balazy et al. Ann. Occup. Hyg. 50(3), 2006 found

filters with the most penentrating particle size in the nanoparticle

Region as shown in the graphs below

slide10

Filter Materials

Test Aerosols: NaCl and Carbon black

Air Flow(s): 1 cm/s and 10 cm/s (corresponds to 95 l/min in facelets)

Test set-up: adapted EN143 set-up with SMPS (TSI 3080) for measurement

I.L. Tuinman NANOSH

Filtration test set-up

  • Three contributing test houses, HSL, TNO, and CIOP, tested six selected filters with NaCl and one other test aerosol

Parameters tested

slide11

A defined selection of electrostatic and mechanical air filter materials in sheet form should be obtained covering the basic filter types applied in RPE and ventilation systems:

    • Electrostatically spun polycarbonate fibers
    • Electrostatically charged split fibers
    • Meltblown
    • Nanofibers
    • Glass fiber filter

I.L. Tuinman NANOSH

Types of filter materials to be included

slide12
I.L. Tuinman NANOSH

Controlled flow through filter

Dry, clean air

36 or 3.6 l/min

Filter test chamber

Aerosolmixer

To r

Excess aerosol flow

SMPS with DMA 3085

and UCPC 3786

Diffusion dryer

Collison

nebulizer

conclusions and remarks
I.L. Tuinman NANOSHConclusions and Remarks
  • It is very difficult to measure an increase in nanoparticles in workplaces due to the height of and fluctuations in the backgroundExperiments in clean rooms can add valuable information.
  • Personal samplers can show significant exposure to manufactured nanoparticles
  • High efficiency electret filters tend to have their most penetrating particle size in the nanoparticle range. This has to be taken into account when selecting and testing respirators for workplaces where nanoparticles are expected.
thank y ou for your attention
I.L. Tuinman NANOSHThank you for your attention!

Point of Contact for TNO Respiratory Protection and Clothing

Frans van Gemerden

Email: frans.vangemerden@tno.nl

Tel: +31 6 52803608