“…7 Previously, diverse sensitive techniques have been established and successfully applied for the determination of As, such as ion chromatography, 8,9 atomic absorption spectroscopy, 10,11 inductively coupled plasma mass spectrometry, 12,13 and neutron activation analysis. 5 However, these techniques still showed several limitations, such as large-scale and expensive instruments, complications in performing the methods, and being time-consuming. Hence, a simple and inexpensive analytical approach for the determination of As in herbal medicines is necessary, particularly in limited-resource settings.…”