Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison between sampling season onion and concentration of the lead and cadmium (µg kg−1).
| Heavy metals | Frequency | P | ||
|---|---|---|---|---|
| Seasons | Mean ± S.D | |||
| Pb | Winter | 15 (68.2%) | 154.29 ± 163.68 | 0.401 |
| Autumn | 7 (31.8%) | 215.45 ± 135.14 | ||
| Cd | Winter | 15 (68.2%) | 44.39 ± 57.57 | 0.058 |
| Autumn | 7 (31.8%) | 148.76 ± 187.18 |
