Smartphone-enabled field monitoring tool for rapid hexavalent chromium detection in water

Development of Quick Test Method for Soil pH, Nitrate, Phosphorus, and Potassium Combining Chemicals and Phone Cellular Application

“…Yamin et al (2020) using only water extractor and not integrated to phone cellulars to detect color to determined macronutrients in oil palm plantation. Bamane et al (2021) using a smartphone as a monitoring tool for rapid hexavalent chromium detection in water. Phone cellular technology has exciting opportunities to develop low-cost decision support tools in agriculture, and it can be explored more in the future.…”

Smartphone-Based Colorimetric Detection of Chromium (VI) by Maleic Acid-Functionalized Gold Nanoparticles

“…2− and Cr 2 O 7 2− [1][2][3][4][5][6][7]. While Cr(III) plays a vital role in maintaining normal life activities [2][3][4][5]7,8], Cr(VI) is widely recognized as a highly toxic pollutant [2][3][4]6,7,9,10] with carcinogenic [2][3][4][5]7,8,11] and mutagenic effects [4,5,7]. Cr(VI) can cause metabolic disorders and damage to the kidney and other organs [5,10,[12][13][14][15][16].…”

“…Fortunately, the existing methods, including atomic absorption spectroscopy, [2][3][4][6][7][8][9][10][17][18][19][20], inductively coupled plasma-mass spectrometry [7,8,10,20,21] and inductively coupled plasma-optical emission spectrometry, [7,10,22,23], could provide an extremely sensitive, selective and reliable way for the detection of Cr(III) and Cr(VI) in real samples [7]. However, these methods usually involve tedious sample preparation, expensive equipment use, and lab-based tests [2][3][4][6][7][8][9][10][11]. Therefore, there is always an urgent demand for the development of mobile, simple and reliable methods for rapid determination of trace Cr(VI) [2,3,8,11] and other pollutants.…”

“…However, these methods usually involve tedious sample preparation, expensive equipment use, and lab-based tests [2][3][4][6][7][8][9][10][11]. Therefore, there is always an urgent demand for the development of mobile, simple and reliable methods for rapid determination of trace Cr(VI) [2,3,8,11] and other pollutants.…”

“…The smartphone, very portable and capable of high-resolution imaging, is a natural candidate for a powerful and convenient point-of-care analytical device. Specifically, smartphone-based colorimetric methods for environmental monitoring of heavy metal ions have been reported [2,11,[43][44][45][46][47][48][49][50][51][52][53]. Herein, we describe an Au NPs-based colorimetric method for the detection of aqueous Cr(VI).…”