2D	two dimensional
3D	three dimensional
AOAC	Association of Official Analytical Chemists
CMYK	cyan, magenta, yellow, key
CRM	certified reference materials
DAD	diode array detector
ePAD	electrochemical paper-based analytical device
ePAD-RGO-CuNP/GCE	glassy carbon electrode modified with reduced graphene oxide doped with copper nanoparticles electrochemical paper analytical device
ePAD/BCF	electrochemical paper-based device modified with functionalized bamboo-derived biochar
EV	exposure value
FDA	Food and Drug Administration
FeSA	tetraacuosalicylate-Fe(III) ion
HPLC	high-performance liquid chromatography
HSL	hue, saturation, lightness
HSV	hue, saturation, value
ISO	International Organization for Standardization
IUPAC	International Union of Pure and Applied Chemistry
LC	liquid chromatographic
LOD	limit of detection
LOQ	limit of quantification
MS	mass spectrometry
PAD	paper-based analytical device
μPAD	microfluidic paper-based analytical device
PoCT	point-of-care testing
PoP-PAD	pen-on-paper paper-based analytical device
RGB	red, green, blue
RSD	relative standard deviation
UV	ultraviolet
VA-DLLME-DIC	vortex-assisted dispersive liquid–liquid microextraction with smartphone-based digital image colorimetry
WB	white balance