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  4. Assessing Analytical Methods for the Rapid Detection of Lead Adulteration in the Global Spice Market
 
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research article

Assessing Analytical Methods for the Rapid Detection of Lead Adulteration in the Global Spice Market

Lopez, Alandra M.
•
Nicolini, Carla M.
•
Aeppli, Meret  
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November 7, 2022
Environmental Science & Technology

Lead adulteration of spices, primarily via Pb chromate compounds, has been documented globally as a growing public health concern. Currently, Pb detection in spices relies primarily on expensive and time-consuming laboratory analyses. Advancing rapid Pb detection methods, inclusive of their accuracy and precision, would improve field assessments by food safety inspectors, stakeholders, and the public in the hope of reducing Pb exposure risks at its source. Here, we present two field procedures for Pb detection: portable X-ray fluorescence analysis (pXRF) and a simple colorimetric test. We assess their efficacy to detect Pb and its chemical form in seven spice types, including powders, spice-salt mixtures, and dried roots, compared to the proven laboratory technique, inductively coupled plasma mass spectrometry (ICP-MS). Lead concentrations measured using pXRF and ICP-MS were within 5% of each other for spice powders and 24% for dried roots. By pXRF, spice samples were analyzed within collection plastic bags without preparation, resulting in a detection limit of 2 mg Pb/kg for spice powders, which is comparable to national food standards. The colorimetric test utilized here targets hexavalent chromium, making the method selective to Pb chromate adulteration assuming that this is its dominant source in spices. Color development, and thus detection, was observed when Pb concentrations exceeded approximately 5-70 mg/kg in dried turmeric roots and 1000 mg/kg in spice powders; however, it was ineffective for the spice-salt mixture. We show that pXRF analysis and a colorimetric assay provide information that may improve field decisions about Pb adulteration in a range of spice types, helping to minimize Pb exposure.

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Type
research article
DOI
10.1021/acs.est.2c03241
Web of Science ID

WOS:000883322400001

Author(s)
Lopez, Alandra M.
•
Nicolini, Carla M.
•
Aeppli, Meret  
•
Luby, Stephen P.
•
Fendorf, Scott
•
Forsyth, Jenna E.
Date Issued

2022-11-07

Publisher

AMER CHEMICAL SOC

Published in
Environmental Science & Technology
Volume

56

Issue

23

Start page

16996

End page

17006

Subjects

Engineering, Environmental

•

Environmental Sciences

•

Engineering

•

Environmental Sciences & Ecology

•

pb

•

lead chromate

•

spices

•

adulteration

•

rapid detection

•

pxrf

•

colorimetry

•

icp-ms

•

exposure

•

field

•

confidence

•

blood

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SOIL  
Available on Infoscience
December 5, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/192965
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