BioMed Research International / 2016 / Article / Tab 4

Research Article

Use of Mercury in Dental Silver Amalgam: An Occupational and Environmental Assessment

Table 4

Mean mercury concentration (mg/L) in wastewater of dental clinics, from Lahore.

Collection siteNumber of chairsMean HgMean Hg

Clinic A2183.0 (±20.7)237.0 (±33.2)
Clinic B3221.7 (±71.7)264.0 (±22.3)
Clinic C2248.3 (±32.2)279.4 (±76.8)
Clinic D1257.0 (±36.1) 299.7 (±32.2)
Clinic E3261.0 (±83.4) 313.7 (±19.7)
Clinic F2107.0 (±47.9)161.5 (±36.1)
Clinic G2162.7 (±51.8)259.0 (±65.5)
Clinic H2137.3 (±35.6)211.3 (±15.7)
Clinic I1 115.7 (±16.8)186.3 (±29.5)
Clinic J2162.0 (±20.7)237.0 (±25.7)
Clinic K286.7 (±56.3)112.0 (±23.2)
Clinic L2179.0 (±62.2)251.7 (±42.6)
Clinic M2156.3 (±88.3)278.0 (±9.71)
Clinic N1164.3 (±49.7)197.3 (±12.0)
Clinic O2212.7 (±7.02)343.3 (±45.7)
Clinic P2169.0 (±13.0)242.7 (±29.5)
Clinic Q2247.0 (±15.5)295.0 (±11.1)
Clinic R3126.0 (±67.6)263.7 (±19.8)
Clinic S2170.7 (±44.6)253.3 (±44.5)
Clinic T2 101.7 (±82.1)218.3 (±17.9)
Clinic U2251.7 (±56.2)318.0 (±25.3)
Clinic V191.3 (±42.8)143.0 (±23.2)

Mean1.95173.3243.9

SD0.5756.5458.23

Each value is the mean of three replicates; the standard deviation of three replicates is presented in parentheses.
Samples collected from discharge point into wastewater collection system.
Samples collected from the side-holding tank of dental chairs.

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