Do You Know What It Costs to Run Your Atomic Spectroscopy Instrumentation?

Robert, T F Ah King

doi:10.1201/b21952-24

Cited by 1 publication

(1 citation statement)

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“…Up to $10,000 for commercial potentiostats [ 56 ]. b approximate range from the literature [ 57 ]. c $300 USD for 100 test strips at the time of writing, however cheaper test strip products are available, starting at around $0.60 per sample [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

Low-cost electrochemical detection of arsenic in the groundwater of Guanajuato state, central Mexico using an open-source potentiostat

Bullen

Dworsky²,

Eikelboom

et al. 2022

PLoS ONE

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Arsenic is a carcinogenic groundwater contaminant that is toxic even at the parts-per-billion (ppb) level and its on-site determination remains challenging. Colorimetric test strips, though cheap and widely used, often fail to give reliable quantitative data. On the other hand, electrochemical detection is sensitive and accurate but considerably more expensive at the onset. Here, we present a study on arsenic detection in groundwater using a low-cost, open-source potentiostat based on Arduino technology. We tested different types of gold electrodes (screen-printed and microwire) with anodic stripping voltammetry (ASV), achieving low detection limits (0.7 μg L-1). In a study of arsenic contaminated groundwaters in Mexico, the microwire technique provides greater accuracy than test strips (reducing the median error from -50% to +2.9%) and greater precision (reducing uncertainties from ±25% to ±4.9%). Most importantly, the rate of false negatives versus the World Health Organisation’s 10 μg L-1 limit was reduced from 50% to 0% (N = 13 samples). Arsenic determination using open-source potentiostats may offer a low-cost option for research groups and NGOs wishing to perform arsenic analysis in-house, yielding superior quantitative data than the more widely used colorimetric test strips.

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