Showing papers by "Pilje Kim published in 2017"
TL;DR: Oxaloacetate of male fish and succinate of female fish showed significant alterations, indicating that PFOA may affect energy metabolism differently by sex, and change of osmolyte content affecting osmosis such as a decrease of male myo-inositol (m-Ino) and an increase of female trimethylamine N-oxide (TMAO) suggest that P FOA might affect osmoregulation of O. latipes.
50 citations
TL;DR: The spatial-temporal dispersion of airborne nanomaterials during the use of spray consumer products and the level of consumer inhalation exposure was evaluated, concluding that the propellant sprays create a higher risk of exposure than the pump sprays.
Abstract: We evaluated the spatial-temporal dispersion of airborne nanomaterials during the use of spray consumer products and estimated the level of consumer inhalation exposure. A total of eight spray products including five propellant and three pump types were selected to evaluate the dispersion of airborne nanoparticles across time and space in a cleanroom which could control the background particles. Four products were advertised to contain silver and one contained titanium nanoparticles, while three products were specified no ENM but as being manufactured through the use of nanotechnology. We used direct-reading instruments with a thermodesorber unit to measure the particles (number, mass, surface area), as well as filter sampling to examine physicochemical characteristics. Sampling was conducted simultaneously at each location (1 m, near-field; 2, 3 m, far-field) by distance from the source. We estimated the inhaled doses at the breathing zone, and the doses deposited in each part of the respiratory tract us...
34 citations
TL;DR: It is demonstrated that PFAA mixture could have the potential of multi-generational endocrine disruptors in O. latipes.
27 citations
4 citations
TL;DR: It is suggested that the ARIMA model could be used to process real-time monitoring data especially for non-stationary data, and averaging time setting is flexible depending on the data interval required to capture the effects of processes for occupational and environmental nano measurements.
Abstract: Real-time monitoring is necessary for nanoparticle exposure assessment to characterize the exposure profile, but the data produced are autocorrelated This study was conducted to compare three statistical methods used to analyze data, which constitute autocorrelated time series, and to investigate the effect of averaging time on the reduction of the autocorrelation using field data First-order autoregressive (AR(1)) and autoregressive-integrated moving average (ARIMA) models are alternative methods that remove autocorrelation The classical regression method was compared with AR(1) and ARIMA Three data sets were used Scanning mobility particle sizer data were used We compared the results of regression, AR(1), and ARIMA with averaging times of 1, 5, and 10 min AR(1) and ARIMA models had similar capacities to adjust autocorrelation of real-time data Because of the non-stationary of real-time monitoring data, the ARIMA was more appropriate When using the AR(1), transformation into stationary d
3 citations
TL;DR: In this article, the hydrodynamic diameters (HDD) of the nZnO in dispersion ranged between 150 and 200 nm according to the dynamic light scattering (DLS) measurement.
Abstract: Toxicity and fate assessment is necessary in the evaluation of the environmental, health and safety risks of engineered nanomaaterials (ENMs). Therefore, in order to ensure the reproducibility, reliability and relevance of ENMs toxicity results, stable and monomodal dispersion protocols in toxicity test media are needed. Zinc oxide nanoparticles (nZnO) are widely used in various products such as cosmetic products, paper, paints etc. In this study, nZnO dispersions in ecotoxicity test media were produced by following a series of steps of modified National Institute of Standards and Technology (NIST) Special publication 1200-5. In addition, natural organic matter (humic acid (HA)) was used as a stabilizing agent to disperse nZnO in the test media. The hydrodynamic diameters (HDD) of the nZnO in dispersion ranged between 150 and 200 nm according to the dynamic light scattering (DLS) measurement. Based on these dispersions in ecotoxicity test using ecological species (Oryzias latipes, Daphnia magna, Pseudokirchneriella subcapitata and Chironomusus riparius), dispersion protocol was found to have a considerable potential in ecotoxicity test of ENMs.