Sensitive Determination of Hexavalent Chromium Using a μPAD
山陽小野田市立山口東京理科大学紀要 Issue 4
Page 1-5
published_at 2021-03-31
Title
μPADによる六価クロムの高感度定量
Sensitive Determination of Hexavalent Chromium Using a μPAD
Abstract
Chromium has diverse oxidation states, the charges of +3 and +6 for chromium occur the most commonly within chromium compounds. Trivalent chromium (Cr(III)) is not toxic and is essential for living organisms. On the other hand, hexavalent chromium (Cr(VI)) is known to has the strong ability to oxidize and to be a carcinogen. Therefore, it is important selectively to determine of Cr(VI) for the analysis of chromium due to the difference of toxicity between Cr(III) and Cr(VI). 1, 5-Diphenylcarbazide (DPC) is a reagent which selectively reacts with Cr(VI) to color violet complex. We have developed a simple and sensitive analysis of Cr (VI) using a micro fluidic paper-based analytical device (μPAD) with the DPC colorimetric reaction. The fabrication of μPADs was carried out by melting wax with an oven after the pattern was printed with a wax printer. The detection spots were dropped DPC solution and dried. Then, the sample solution was dropped into the sampling spot and wicked to the detection spots. μPAD was scanned with a scanner, the color intensity for the detection spots was analyzed by an image analysis software. The RGB intensity of the images was analyzed, and the highest sensitivity was obtained when G-intensity was used. The detection limit of this device for the Cr(VI) analysis was 26.2 μg/L, the sensitivity for present method has been enhanced compared to the previous method (30 mg/L).
Source Identifiers
Creator Keywords
Microfluidic paper-based analytical device
Hexavalent chromium
Diphenylcarbazide colorimetric reaction
マイクロ流体ペーパー分析デバイス
六価クロム
ジフェニルカルカルバジド呈色反応
Languages
jpn
Resource Type
departmental bulletin paper
Publishers
山陽小野田市立山口東京理科大学
Date Issued
2021-03-31
File Version
Version of Record
Access Rights
open access
Relations
[ISSN]2434-2866