array(3) {
  [0]=>
  int(17421)
  [1]=>
  string(248) "Pan Y., Chen M., Wang X., Chen Y. Ecological risk, source apportionment, and influencing factors of heavy metals in soil in a typical lead-zinc mining watershed, Guangxi, China // Journal of Environmental Chemical Engineering. 2024. vol. 12. no. 3."
  [2]=>
  int(7)
}
<h1>DB Error 230: Duplicate entry '17421-7' for key 'citations.citations_submission_seq'</h1>