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Article

Effects of Filter-Membrane Materials on Concentrations of Trace Elements in Acidic Solutions

1
Research Center for Geochronology and Isotope Analysis, Korea Basic Science Institute, Cheongju-si, Chungbuk 28119, Korea
2
Center for Research Equipment, Korea Basic Science Institute, Cheongju-si, Chungbuk 28119, Korea
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3497; https://doi.org/10.3390/w12123497
Received: 26 November 2020 / Revised: 10 December 2020 / Accepted: 10 December 2020 / Published: 12 December 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
Filtration is commonly used to separate liquids from solid materials before the determination of trace element concentrations in aqueous solutions. Therefore, it is important to determine how much elemental content is extracted from the filter itself or lost via absorption into the filter. In this study, we investigated three types of disposable syringe filters (polyvinylidene difluoride, PVDF; polytetrafluoroethylene, PTFE; PTFE with glass microfiber prefiltration media, GD/X) and their acid-cleaned versions using ammonium nitrate (NH4NO3) and acetic acid (HOAc) solutions. The concentrations of most trace elements (Li, Al, Cr, Mn, Co, Ni, Cu, Zn, Rb, Sr, Mo, Cd, Cs, Ba, Pb, and U) were higher in filtrates that had passed through acid-cleaned filters than those that had passed through uncleaned filters. In filtrates from PVDF and PTFE filters, many trace elements were below the detection limit. However, regardless of the filter type and acid cleaning, Li, Cu, Zn, Mo, and Ba concentrations in filtrates of NH4NO3 solutions, and Al, Cr, Mn, Cu, Zn, and Ba concentrations in filtrates of HOAc solutions were much higher than those of other trace elements. These differences were particularly noticeable in filtrates from GD/X filters containing glass microfiber layers. These data indicate that certain trace elements can be released from membrane materials by reacting with acid in the filtered solution. Furthermore, the amounts of each trace element were associated with the membrane type. These findings suggest that filter type should be carefully selected to obtain the required accuracy, in consideration of the target elements and whether an acid-cleaned filter is needed. View Full-Text
Keywords: trace elements; acid-cleaned filter; ammonium nitrate; acetic acid; membrane types trace elements; acid-cleaned filter; ammonium nitrate; acetic acid; membrane types
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MDPI and ACS Style

Shin, W.-J.; Shin, H.-S.; Hwang, J.-H.; Lee, K.-S. Effects of Filter-Membrane Materials on Concentrations of Trace Elements in Acidic Solutions. Water 2020, 12, 3497. https://doi.org/10.3390/w12123497

AMA Style

Shin W-J, Shin H-S, Hwang J-H, Lee K-S. Effects of Filter-Membrane Materials on Concentrations of Trace Elements in Acidic Solutions. Water. 2020; 12(12):3497. https://doi.org/10.3390/w12123497

Chicago/Turabian Style

Shin, Woo-Jin; Shin, Hyung-Seon; Hwang, Ji-Hun; Lee, Kwang-Sik. 2020. "Effects of Filter-Membrane Materials on Concentrations of Trace Elements in Acidic Solutions" Water 12, no. 12: 3497. https://doi.org/10.3390/w12123497

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