Table 1.

Summary of studies assessing arsenic concentrations in rice.

Study Location	Author(s) and Year	Source of Rice	Type of Arsenic Measured	Mean (mg/kg) ± SD (Range)
USA	He et al. 2010 [23]	Samples purchased in New York	Total As	0.14 ± 0.0050
Japan	Narukawa et al. 2012 [24]	20 samples from all over Japan	iAs	0.10 (0.056–0.20)
Bangladesh, China, USA	Norton et al. 2012 [25]	6 field trials	Total As	Faridpur: 0.44 (0.19–0.90) Qiyang: 0.68 (0.36–1.27) Arkansas (2006): 0.38 (0.10–0.99) Arkansas (2007): 0.25 (0.030–1.040) Texas (flooded): 0.63 (0.17–1.68) Texas (non-flooded): 0.045 (0.0090–0.13)
China	Sun et al. 2012 [26]	2 samples from market in Guangzhou and rice field in Hunan Province	iAs	0.35 ± 0.0060 (0.40–0.29)
China	Dai et al. 2014 [27]	108 samples from local markets	iAs	Jiangsu: 0.063 Jiangxi: 0.057 Zhejiang: 0.059 Mean of all: 0.059 Range of all: (0.027–0.098)
China	Fang et al. 2014 [18]	92 samples from fields of main rice-growing provinces	Total As	Northern China 0.050 ± 0.040 (* ND–0.13) Southern China 0.11 ± 0.050 (* ND–0.14)
Bangladesh	Ahmed et al. 2016 [21]	10 market samples	Total As	0.32 ± 0.16 (0.14–0.43)
China	Chen et al. 2018 [20]	160 samples from local markets in 20 provinces	iAs	0.054 (0.0090–0.13)

* ND = not detectable.