Table 5.

Comparison between the results of this study and other studies (MPs abundance, dominant MPs, and MPs type).

References	Origin	Salt type	No of salt brand	MP abundance (MP/kg)	MP identification technique	Filter pore size (μm)	Dominant MP types		Human intake (MPs capita− 1 Salt yr− 1)
							Shape	Polymer
(Yang et al., 2015)	China	Sea salt Lake salt Rock/well salt	5	550–681	Visual/FTIR	100–200	Fiber	PET > PE > cellophane	-
(Karami et al., 2017)	6 countries	Sea salt	15	0–10	Raman	149	Fragment	PP, PE, poly-acrylonitrile	37
	2 countries	Lake salt	2	0
(Renzi et al., 2019)	Italy, Croatia	Sea salt	11	1570–39,800	Visual	0.45	Fragment for Italy Fiber for Croatia	-	36.5–36,172
(Seth and Shriwastav, 2018)	India	Sea salt	8	56–103	μ-FTIR	0.45	Fragment	PES, PE, PA	188
(Kim et al., 2018)	16 countries	Sea salt	28	0–13,629	0–13,629	100–500	Fragment	PE > PP > PET	-
(Lee et al., 2019)	6 countries	Sea salt	10	2.5–20	μ-FTIR	5	Fragment	PP, PE, PS	35.8
	Thailand	Rock salt	1	12.5			Fragment	PP
(Lee et al., 2021)	Korea	Sea salt	1	2395	μ-FTIR	20	Fragment	PP, PE	12,000
(Sharifi and Movahedian Attar, 2021)	Iran	Crystallized salt	-	151.4 ± 48.8	Micro-Raman	0.45	Fiber, Fragment	PP, PE, PET	-
		Refined sea salt		406.7 ± 93.3
		Unrefined sea salt		1288.6 ± 184.9
		Rock salt		283.4 ± 97
(Nakat et al., 2023)	Lebanon		16	0–635.2	FTIR	0.7	-	PP, PS, PE, thermoplastic elastomers	2372
(Özçifçi et al., 2023)	Turkey	Sea salt Lake salt Rock salt	36	39 ± 30	FTIR		fiber, granulated, film	CPE	150
This study	Iran	Sea salt	13	700–4248	> 100 (FTIR) < 100 (Micro-Raman)	0.45	Fragment, Fiber	CA, PE, PS, PP, ABS, PET	-
		Rock salt	13	760–2368
		Bulk salt	8	726–2196
		Non-standard	6	720–5470