Table 2.

Hg content in honey from various countries.

Area	Type	n	Hg (μg kg−1) (range)	Reference
Central Italy	All honey	100	0.19 ± 0.16 (0.0815–0.8950)	This study
	Monofloral	44	0.2 ± 0.2 (0.08–0.90)
	Multiflower	56	0.2 ± 0.1 (0.09–0.80)
Central Italy	Mainly multiflower	21	7 ± 9 (<1−34)	[32]
Italy	Mono- and multifloral	72	0.19 ± 0.17 (0.04–1.46)	[33]
Poland	All	108	0.43 ± 0.41 (0.01–1.71)	[45]
	Acacia	10	0.41 ± 0.32 (0.01–1.03)
	Phacelia	4	0.36 ± 0.18 (0.11–0.52)
	Buckwheat	15	0.28 ± 0.28 (0.07–1.11)
	Linden	15	0.35 ± 0.28 (0.01–0.97)
	Dandelion	2	0.12 ± 0.13 (0.03–0.22)
	Goldenrod	5	0.36 ± 0.54 (0.02–1.30)
	Rapeseed	10	0.25 ± 0.20 (0.01–0.71)
	Sunflower	2	0.27 ± 0.24 (0.10–0.44)
	Honeydew	13	0.72 ± 0.46 (0.07–1.55)
	Multifloral	30	0.54 ± 0.53 (0.06–1.71)
	Heather	2	0.29 ± 0.26 (0.11–0.47)
Poland	All	32	0.37 ± 0.33 (0.02–1.55)	[47]
	Lipowy	5	0.52 ± 0.31 (0.16–0.97)
	Multifloral	9	0.31 ± 0.21 (0.06–0.70)
	Acacia	2	0.33 ± 0.04 (0.30–0.36)
	Goldenrod	3	0.04 ± 0.04 (0.02–0.09)
	Rape	3	0.37 ± 0.30 (0.18–0.71)
	Honeydew	3	1.02 ± 0.49 (0.59–1.55)
	Buckwheat	7	0.19 ± 0.11 (0.07–0.35)
Croatia	Multiflower	54	2.72 (1–315)	[48]
Slovakia (uncontaminated area)			(50–212)	[49]
Slovakia (contaminated area)			(1–3)
Aliaga, Turkey		5	n.d.	[50]
Central Cuba	Singing bean	16	<0.010
	Linen vine	17	<0.010
	Black mangrove	16	<0.010
	Christmas vine	18	<0.010
	Morning glory	16	<0.010
Zhejiang province, China	All	48	1.65 ± 0.14	[52]
	Acacia	6	2.51 ± 0.19
	Linden	6	4.00 ± 0.31
	Citrus	6	0.80 ± 0.07
	Multifloral	6	2.23 ± 0.21
	Litchi	6	1.26 ± 0.09
	Loquat	6	0.55 ± 0.04
	Jujube	6	0.34 ± 0.02
	Yellow box	6	1.51 ± 0.12
South Korea (urban)		1	3249	[57]
South Korea (agricultural)		1	1009
South Korea (mountain)		1	665
Singida, Tanzania		90	10.28 (0.38–31.69)	[18]
Nigeria		9	654 ± 10	[53]
Libya		24	(21–100)	[54]
Malesia	Tualang	2	43 ± 47	[55]
	Gelam	2	14 ± 13
	Pineapple	2	19 ± 20
	Borneo	2	56 ± 62
	Kelulut	3	22 ± 16
	Manuka	3	26 ± 2
	Commercial Y	3	13 ± 0
	Commercial Z	3	2 ± 0

n.d.: not detected.