Determination of Toxic and Low-Temperature Elements As, Sb, Cd and Tl in Rapeseeds by Inductively Coupled Plasma-Mass Spectrometry with Slurry-emulsion System Sampling

DONG Shuxia; XIE Ningning; HAN Jiqing; XIONG Junbiao; WU Shaowei

doi:10.15898/j.cnki.11-2131/td.202109250127

Rock and Mineral Analysis > 2022 > 41(3): 364-373. > DOI: 10.15898/j.cnki.11-2131/td.202109250127

DONG Shuxia, XIE Ningning, HAN Jiqing, XIONG Junbiao, WU Shaowei. Determination of Toxic and Low-Temperature Elements As, Sb, Cd and Tl in Rapeseeds by Inductively Coupled Plasma-Mass Spectrometry with Slurry-emulsion System Sampling[J]. Rock and Mineral Analysis, 2022, 41(3): 364-373. DOI: 10.15898/j.cnki.11-2131/td.202109250127

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Determination of Toxic and Low-Temperature Elements As, Sb, Cd and Tl in Rapeseeds by Inductively Coupled Plasma-Mass Spectrometry with Slurry-emulsion System Sampling

DONG Shuxia^{1, 2,},
XIE Ningning^{1, 2},
HAN Jiqing¹,
XIONG Junbiao¹,
WU Shaowei^{1, 2, ,}

1.
College of Chemistry and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, China
2.
Hubei Engineering Research Center of Selenium Food Nutrition and Health Intelligent Technology, Enshi 445000, China

More Information

Received Date: September 24, 2021
Revised Date: January 21, 2022
Accepted Date: March 12, 2022
Available Online: July 28, 2022

Abstract

HIGHLIGHTS
(1) Dissolving the rapeseed sample with strong acid is a lengthy process and is vulnerable to pollution. The rapeseed was synchronously treated by suspension and emulsification to prepare a uniform and stable slurry-emulsion system.

(2) Rapeseed residue cake refinement suspension cooperated with emulsified oil beads to disperse uniformly. SES injection solved the difficulty of analysis of high-oil samples.

(3) Optimisation of the temperature programming parameters of ETV effectively overcomes the interference of ⁴⁰Ar³⁵Cl polyatomic ions on ⁷⁵As during mass spectrometry determination.

ABSTRACT

BACKGROUND
The quality of rapeseed and the degree of heavy metal pollution are directly related to human health. Monitoring the content of toxic elements such as As, Sb, Cd, and Tl in rapeseed is helpful for early monitoring of raw materials for edible oil production.
OBJECTIVES
To avoid the cumbersome pretreatment of strong acid digestion, quickly determine the accurate content of volatile toxic elements such as As, Sb, Cd, and Tl in rapeseed, and to solve the challenge of pretreatment due to the heavy fat content of grains, oils, and foods.
METHODS
A suspension-emulsion synergistic sample preparation technique was used to investigate conditions affecting suspension-emulsion, and a homogeneous and stable slurry-emulsion solution (SES) system was prepared. In the electrothermal vaporizer (ETV) with high sampling efficiency, the temperature-programmed parameters and the dosage of improver palladium nitrate were all optimized. SES was directly injected, and inductively coupled plasma-mass spectrometry (ICP-MS) was used to determine As, Sb, Cd and Tl.
RESULTS
The overall reproducibility (relative standard deviation, RSD) of the suspension-emulsion sampling-ETV-ICP-MS detection method were 10.1%, 8.8%, 8.9% and 6.4% [c=0.5% (m/V), n=5] for As, Sb, Cd and Tl, respectively. Under the optimum conditions, the limits of detection (3σ) were 40.0ng/L, 20.0ng/L, 50.0ng/L and 10.0ng/L for As, Sb, Cd and Tl, respectively. Accordingly, the limits of detection for the original solid samples were 8.0ng/g, 4.0ng/g, 10.0ng/g and 2.0ng/g for As, Sb, Cd and Tl, respectively. The contents of As, Sb, Cd and Tl in tested rapeseed samples were 50.4-90.5ng/g, 28.0-59.9ng/g, 51.3-69.1ng/g and 91.3-216.6ng/g, respectively.
CONCLUSIONS
The suspension-emulsion synergistic treatment of rapeseed with high oil content is simple, fast, and cost efficient. It utilizes the advantages of ETV sampling and promotes the application of ETV-ICP-MS solid sampling analysis.
- rapeseed,
- slurry-emulsion solution,
- electrothermal vaporization,
- inductively coupled plasma-mass spectrometry,
- As,
- Sb,
- Cd,
- Tl

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References (35)

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