sample    sample_type  month  day  year  date        cast        lat       lon         depth_w  depth  sal    Mn_tot  Mn_diss  O2     temp  filter_type           filter_pore_size  
GD-1      plume        07     18   2004  07/18/2004  11-2 #14    27.01372  -111.41090  2040     1996   34.61  356     145      27.4   3     142 mm polycarbonate  0.2               
GD-2      plume        07     11   2004  07/11/2004  11-1 #8     27.03087  -111.40000  2040     1775   34.61  257     59       27     3     142 mm polycarbonate  0.2               
GD-5      plume        02     05   2005  02/05/2005  21-6 #2     27.03733  -111.36317  2771     1963   34.61  315     62       26     2.9   142 mm polycarbonate  0.2               
GD-6      plume        07     16   2004  07/16/2004  12-27a #1   27.50600  -111.34697  2050     1950   34.61  288     40       27.7   3     142 mm polycarbonate  0.2               
GD-7/9    background   07     13   2004  07/13/2004  12-8 #12    27.48623  -111.36407  2060     1597   34.61  55      5        28.5   3     142 mm polycarbonate  0.2               
GD-8/10   background   08     04   2004  08/04/2004  34-2 #7     26.37925  -110.72388  2771     1900   34.62  21      7        46.5   2.6   142 mm polycarbonate  0.2