Table 2: Mean concentrations of heavy metals in mg L−1 (±SEM) () in the sediment of gray mangrove .

SiteDepth (cm)/metalsCrCuFeMnNiPbZn

Tubli0527.3 85.7
4521.5 86.4 7.7 26.2 110.7
51524.1 65.7
3597.0
81.7 7.0 22.1 82.4
153017.2 17.5 2646.1 70.9 3.3 15.5 32.9

Sitra (1)0518.8 21.5 3920.0 71.1 6.00 15.2 35.5
51518.9 13.1 3675.7 71.7 5.3 13.3 24.1
153018.2
11.9 3425.4 63.4 6.2 12.97 21.2

Sitra (2)0516.9 16.6 3542.5 59.7 4.4 16.2 36.3
51516.2 13.3 3336.6 57.4 5.3 18.0 37.7
153011.8 11.02 2319.3
35.1 1.9 17.2 22.4

Dehghani and Karbassi (2015)30.11189425.0843.70

Einollahipeer et al. (2013)42.1354.1247.9043.61

NOAA81342146150

Canadian (ISQGs)521830124

EPA

Nonpolluted<25<25<20<40<90

Slightly polluted25–7525–5020–5040–6090–200

Severely polluted>76>50>50>60>200

in the same column not connected with the same letter are significantly different (). Mo concentration in mangrove sediment was less than 0.001 mg L−1; NOAA (1997 revision), http://www.esd.ornl.gov/programs/ecorisk/documents/tm95r4.pdf; Canadian (ISQGs), https://www.elaw.org/system/files/sediment_summary_table.pdf; US EPA, 1991. Sediment quality guidelines. Draft report. EPA Region V Chicago IL.