Details:

Alternative Title:
Aerosol Sci Technol
Personal Author:
Zheng, Lina ; Kulkarni, Pramod ; Birch, M. Eileen ; Deye, Gregory ; Dionysiou, Dionysios D.
Zheng, Lina ; Kulkarni, Pramod ; Birch, M. Eileen ; Deye, Gregory ; Dionysiou, Dionysios D. Less -
Description:
A sensitive, field-portable microplasma spectroscopy method has been developed for real-time measurement of carbon nanomaterials. The method involves microconcentration of aerosol on a microelectrode tip for subsequent analysis for atomic carbon using laser-induced breakdown spectroscopy (LIBS) or spark emission spectroscopy (SES). The spark-induced microplasma was characterized by measuring the excitation temperature (15,000 - 35,000 K), electron density (1.0 × 10(17) - 2.2 × 10(17) cm(-3)), and spectral responses as functions of time and interelectrode distance. The system was calibrated and detection limits were determined for total atomic carbon (TAC) using a carbon emission line at 247.856 nm (C I) for various carbonaceous materials including sucrose, EDTA, caffeine, sodium carbonate, carbon black, and carbon nanotubes. The limit of detection for total atomic carbon was 1.61 ng, equivalent to 238 ng m(-3) when sampling at 1.5 L min(-1) for 5 min. To improve the selectivity for carbon nanomaterials, which consist of elemental carbon (EC), the cathode was heated to 300 °C to reduce the contribution of organic carbon to the total atomic carbon. Measurements of carbon nanotube aerosol at elevated electrode temperature showed improved selectivity to elemental carbon and compared well with the measurements from thermal optical method (NIOSH Method 5040). The study shows that the SES method to be an excellent candidate for development as a low-cost, hand-portable, real-time instrument for measurement of carbonaceous aerosols and nanomaterials.
Subjects:
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Article Carbonaceous Aerosol Carbon Nanomaterials Elemental Carbon Laser-induced Breakdown Spark Emission Spectroscopy
Source:
Aerosol Sci Technol. 50(11):1155-1166.
Pubmed ID:
28638174
Pubmed Central ID:
PMC5476210
Document Type:
Journal Article
Funding:
CC999999/Intramural CDC HHS/United States
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:b5a902f67c79c0fa4e8995703e65889d16a4f0ff3e4fb84c0801f7d5f59162cd
Download URL:
https://stacks.cdc.gov/view/cdc/46805/cdc_46805_DS1.pdf
File Type:

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