Determination of Trace Heavy Metal Elements in Plant Essential Oils by Inductively Coupled Plasma Optical Emission Spectrometry

Ai-yang LI; Liang FU; Lin CHEN

doi:10.3964/j.issn.1000-0593(2022)04-1162-06

Spectroscopy and Spectral Analysis, Volume. 42, Issue 4, 1162(2022)

Determination of Trace Heavy Metal Elements in Plant Essential Oils by Inductively Coupled Plasma Optical Emission Spectrometry

Ai-yang LI^1、*, Liang FU^{2、2; *;}, and Lin CHEN^3、3;

Author Affiliations

¹1. College of Material and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China

²2. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China

³3. Institute of Chinese Materia Medica, Hunan Academy of Traditional Chinese Medicine, Changsha 410013, China

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Figures & Tables(7)

Fig. 1. Multimode sample introduction system (MSIS) setup for dual mode

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Fig. 2. Influence of HCl (a) and NaBH₄ (b) concentrations on signal intensity of As, Sn, Sb, and Hg

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Fig. 3. Spectral interferences for Cd 214.439 nm corrected using FACT

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Table 1. Operation parameters of microwave digestion
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Table 1. Operation parameters of microwave digestion
Step Power
/W Ramp
time/min Temperature
/℃ Hold
temperature/℃
1 1 600 5 120 /
2 1 600 3 150 5
3 160 5 180 15

Table 2. The linearity and the method detection limit (MDL) of the analyte

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Table 2. The linearity and the method detection limit (MDL) of the analyte

Element	Wavelength/nm	linearity range/(μg·L^-1)	Dependent coefficient/r	MDL/(μg·kg^-1)
Cr	267.716	0.22200	1.000 0	8.25
Ni	231.604	0.12200	0.999 9	4.50
As	188.980	0.15200	0.999 8	5.62
Cd	214.439	0.07200	0.999 9	2.63
Sn	189.925	0.05200	1.000 0	1.88
Sb	206.834	0.17200	0.999 8	6.38
Hg	194.164	0.01200	0.999 9	0.38
Pb	220.353	0.31200	0.999 9	11.2

Table 3. Accuracy and precision of analytical method (n=6)

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Table 3. Accuracy and precision of analytical method (n=6)

Element	This method					Found by ICP-MS /(μg·kg^-1)	RE /%
Element	Found /(μg·kg^-1)	RSD /%	Spiked /(μg·kg^-1)	Total found /(μg·kg^-1)	Recovery /%	Found by ICP-MS /(μg·kg^-1)	RE /%
Cr	61.3±3.01	4.9	50.0	109±3.38	95.4	62.2±1.87	-2.1
Ni	30.2±0.66	2.2	50.0	82.3±2.07	104	30.7±0.45	-1.6
As	48.9±2.10	4.3	50.0	99.2±2.13	101	47.6±1.53	2.7
Cd	40.3±1.32	3.3	50.0	91.6±1.45	103	39.5±1.20	2.0
Sn	16.0±0.55	3.4	50.0	65.3±1.67	98.6	16.3±0.48	-1.8
Sb	21.5±0.53	2.5	50.0	72.7±2.80	102	21.2±0.86	1.4
Hg	10.8±0.20	1.9	50.0	58.9±1.36	96.2	10.6±0.35	1.9
Pb	76.2±2.85	3.7	50.0	125±3.04	97.6	74.9±2.02	1.7

Table 4. Analysis results of plant essential oil samples (μg·kg^-1, n=6)

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Table 4. Analysis results of plant essential oil samples (μg·kg^-1, n=6)

Plant essential oil	Cr	Ni	As	Cd	Sn	Sb	Hg	Pb
Mentha canadensis Linnaeus	61.3±3.01	30.2±0.66	48.9±2.10	40.3±1.32	16.0±0.55	21.5±0.53	10.8±0.20	76.2±2.85
Citrus limon (L.) Burm. f.	87.5±2.64	14.6±0.31	116±3.28	21.5±0.53	ND	38.6±1.20	6.21±0.33	50.9±1.70
Rosa rugosa Thunb.	ND	ND	71.5±1.80	73.6±2.19	10.1±0.20	30.4±0.92	ND	96.0±2.13
Lavandula angustifolia Mill.	69.0±2.18	32.0±0.68	ND	ND	ND	17.3±0.51	ND	41.2±1.55
Jasminum sambac (L.) Aiton	ND	ND	ND	26.4±0.97	18.3±0.26	51.0±1.38	4.58±0.17	38.7±1.61
Syringa oblata Lindl.	53.2±1.41	ND	37.8±1.59	30.5±1.10	ND	12.2±0.37	11.5±0.31	44.1±0.82
Rosmarinus officinalis L.	47.0±2.36	ND	ND	ND	ND	26.3±0.64	15.2±0.40	30.5±1.34
Zanthoxylum bungeanum Maxim.	128±3.72	25.2±0.59	41.5±3.02	28.2±0.93	ND	14.9±0.87	7.97±0.25	103±2.86

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Ai-yang LI, Liang FU, Lin CHEN. Determination of Trace Heavy Metal Elements in Plant Essential Oils by Inductively Coupled Plasma Optical Emission Spectrometry[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1162

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