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Table 2 Permissible limits for surface waters according to standards of the World Health Organization [3841], United States Environmental Protection Agency [4244], and Turkish Standard Institute surface water regulations [45]

From: Data analysis of heavy metal content in riverwater: multivariate statistical analysis and inequality expressions

Heavy metals WHO USEPA Turkish surface water regulations (2015)
I II III IV
As (μg/L) 10a 50a ≤20 50 100 >100
Ba (μg/L) 700b 2000c ≤1000 2000 2000 >2000
Co (μg/L) ≤10 20 200 >200
Cr (μg/L) 50a 100a ≤20 50 200 >200
Cu (μg/L) 2000a 1300a ≤20 50 200 >200
Fe (μg/L) 300a 300b,c ≤300 1000 5000 >5000
Mn (μg/L) 100a 50c ≤100 500 3000 >3000
Ni (μg/L) 70a ≤20 50 200 >200
Pb (μg/L) 10a 15a ≤10 20 50 >50
Sb (μg/L) 20b 6b
Zn (μg/L) 3000/1000a 5000c ≤200 500 2000 >2000
Sr (μg/L) 10\(^{\mathrm{c},\mathrm{d}}\)
  a—[41] a—[44]     
  b—[39] b—[43]     
  c—[38] c—[42]     
  d—[40]      
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