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Table 2 Mercury concentration statistics (ng g -1 ) calculated separately for the total data set, each main river, the No Gold Mined Streams (NGMS) and the Gold Mined Streams (GMS)

From: Regional distribution of mercury in sediments of the main rivers of French Guiana (Amazonian basin)

Hg (ng.g-1) French Guiana Comté River Approuague River Mana River Maroni River Oyapock River NGMS GMS
Minimum 12 31 12 24 18 22 19 30
Maximum 1 320* 237 1 320* 768 465 775 231 930
Median 117 91 129 122 129 100 110 154
Medium 152 98 238 143 139 114 108 190
n1 1 211 105 255 212 385 254 241 242
σ 438 45 85 100 69 937 42 137
  1. 1: number of samples, *maximum after removal of two aberrant values from the Approuague River (10.05 and 11.2 μg g-1).