Fig. 4From: Potentially toxic element (PTE) levels in maize, soil, and irrigation water and health risks through maize consumption in northern Ningxia, ChinaProbability exceeding 10− 4 of R (a: below 20 years, b: 20–40 years, c: 40–60 years, d: more than 60 years), the black area represents the exceeding probabilities, and about 14.81, 7.18, 5.83 and 2.08% for a, b, c, and d, respectivelyBack to article page