Yang Zhi and colleagues screened 25 Chinese soybean cultivars for seed cadmium in pots and in the field. Pot spikes were T1 at 1.0 mg Cd/kg soil and T2 at 2.5 mg Cd/kg soil, plus an unspiked control. Table 2 lists pot-culture soil total cadmium at 0.15 mg/kg and field-culture soil total cadmium at 1.22 mg/kg. Cadmium was measured by atomic absorption (Hitachi 180-80). The detection limit is 0.01 mg/kg. Means are of three replicates.
Key numbers
Under T1, seed cadmium ranged from 0.09 to 0.98 mg/kg dry weight, mean 0.44. Eighty percent of cultivars (20 of 25) exceeded 0.20 mg/kg dry weight, the maximum the authors treat as the Chinese permissible level for seed. Under T2 the range was 0.29 to 2.06 mg/kg dry weight, mean 0.81, and all 25 cultivars were above 0.20. Five cultivars are named as low accumulators in the pot work: Shennong 10, Tiefeng 31, Tiedou 36, Tiefeng 37, and Liaodou 21.
In the field, seed cadmium ranged from 0.11 to 0.99 mg/kg, mean 0.47. The results text says Tiefeng 31, Shennong 10, and Tiedou 36 were below 0.20 mg/kg. The abstract instead names Shennong 10, Tiedou 36, and Liaodou 21 as the field cultivars suitable where soil cadmium is below 1.22 mg/kg. Both statements are in the paper. They do not name the same three cultivars.
Methods (brief)
Pot soil was spiked. Field soil was the 1.22 mg/kg soil in Table 2. Dry-weight seed concentrations. Certified reference soybean GBW10013 was used. Cultivar names above are genotypes, not commercial brands.
Evidence fitness
The means and ranges support a dry-weight description of seed cadmium in these cultivars and soils. They do not describe packaged soy foods.
Limitations
The abstract and the field-results paragraph name different trios below 0.20 mg/kg. The 0.20 mg/kg figure is the authors’ cited maximum, and the statute title is not requoted here.
Related evidence
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