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Table 6 Physicochemical parameters measured at the main sampling sites at the time of sampling

From: The importance of sediments in ecological quality assessment of stream headwaters: embryotoxicity along the Nidda River and its tributaries in Central Hesse, Germany

  Main sampling sites
N1 N2 N3 N4 N5 N6 H1 H2 H3 H4 U1 U2 U3 U4
pH
 July 15 7.46 7.86 7.37 7.43 7.62 7.81 7.79 7.91 7.77 7.84 7.09 7.92 8.20 7.75
 November 15 7.56 7.99 7.50 7.74 7.77 7.77 7.43 7.83 7.95 7.84 7.10 7.50 7.40 7.66
 January–April 16 6.98 6.98 6.73 7.27 7.11 7.37 7.19 7.21 7.69 7.98 7.00 7.31 7.10 7.35
 July 16 7.85 7.73 7.36 7.36 7.58 7.62 7.76 7.30 7.54 7.36 7.64 7.85 7.96 7.73
Nitrate [NO3–N] (mg/L)
 July 15 1.20 1.40 1.70 2.70 2.60 2.70 0.50 1.70 5.00 2.80 2.50 5.60 3.60 3.70
 November 15 2.00 4.00 8.00 11.0 9.00 12.0 2.00 5.00 7.00 5.00 4.00 23.0 14.0 21.0
 January–April 16 7.00 13.0 8.00 2.71 2.26 15.0 7.40 > 20.0 0.70 0.90 3.40 4.20 3.90 4.40
 July 16 8.10 10.6 12.2 12.0 10.9 8.10 4.30 4.40 7.03 3.80 3.90 5.50 4.60 3.90
Nitrite [NO2–N] (mg/L)
 July 15 0.01 0.01 0.10 0.08 0.09 0.04 0.01 0.02 0.05 0.06 0.05 0.02 0.04 0.13
 November 15 0.01 0.01 0.07 0.09 0.07 0.05 < 0.003 0.02 0.04 0.03 0.01 0.02 0.03 0.13
 January–April 16 0.02 0.02 0.02 0.004 0.01 0.05 0.03 0.03 0.04 0.03 0.04 0.06 0.05 0.11
 July 16 0.01 0.02 0.20 0.04 0.04 0.04 0.02 0.03 0.05 0.06 0.04 0.01 0.06 0.13
Ammonium [NH4–N] (mg/L)
 July 15 0.06 0.04 0.26 0.08 0.14 0.07 0.05 0.05 0.22 0.16 0.09 0.04 0.17 0.18
 November 15 < 0.04 0.04 0.67 0.34 0.23 0.21 < 0.04 0.10 0.16 0.10 < 0.04 < 0.04 0.07 0.27
 January–April 16 < 0.04 < 0.04 0.12 0.08 0.10 0.13 0.05 0.05 0.06 0.07 < 0.04 0.09 0.12 0.20
 July 16 < 0.04 0.06 0.68 0.04 0.05 0.07 < 0.04 0.15 0.11 0.10 0.07 0.05 0.16 0.09
Phosphate [PO4–P] (mg/L)
 July 15 < 0.05 0.05 0.17 0.26 0.30 0.32 0.05 0.12 0.16 0.22 0.06 0.27 0.13 0.28
 November 15 0.05 0.05 0.13 0.28 0.37 0.26 < 0.05 0.20 0.16 0.17 0.10 0.22 0.17 0.28
 January–April 16 < 0.05 < 0.05 0.10 0.02 0.05 0.16 0.07 0.12 0.19 0.19 0.20 0.25 0.27 0.22
 July 16 0.07 0.08 0.12 0.24 0.22 0.27 0.08 0.16 0.17 0.25 0.10 0.32 0.20 0.19
Chloride [Cl] (mg/L)
 July 15 8.0 10.0 28.0 73.0 86.0 > 200 5.0 18.0 108 106 29.0 91.0 120 > 200
 November 15 9.0 17.0 61.0 85.0 83.0 256 8.0 31.0 86.0 85.0 28.0 71.0 96.0 824
 January–April 16 11.0 25.0 22.0 35.0 29.0 83.0 < 2.5 < 2.5 20.0 25.0 22.0 34.0 34.0 270
 July 16 11.0 14.0 40.0 39.0 46.0 194 7.0 23.0 80.0 96.0 47.0 67.0 69.0 > 200
  1. The third sampling campaign was conducted in January (Usa), February (Nidda) and April (Horloff) 2016