TABLE 1.

Major anions and cations in borehole D8A

Depth (m)—date (mo/day/yr)Temp (°C)Concn (mM) of indicated speciesa
TOCAcetateFormatePropionateDICClHSbSO42−NH4+Na+Ca2+Mg2+Fe2+
Outlet—08/30/0143.30.290.0130.00050.00020.10431.00.60 (0.494)0.1250.01113.91.70.0270.0013
Outlet—09/15/0143.3NANANANANANANANA0.00614.51.9<0.002<0.0001
Outlet—10/24/01430.400.0350.00200.00070.10431.71.480.137<0.01111.11.70.0060.00002c
125—10/24/01460.110.0330.00200.00070.13926.30.600.033<0.01115.52.30.0100.0009c
125—10/25/0146NA0.0400.00410.0014NA25.9NA0.0370.08216.52.20.0130.00002c
250—10/24/01540.140.0360.00310.00100.11226.70.700.0350.0007c15.82.20.0130.0030
250—10/25/0154NA0.0320.00350.0012NA28.8NA0.0350.07NANANANA
390—10/24/01540.330.0340.01270.00420.14126.11.200.0260.06915.42.30.012<0.0001
550—10/25/01540.170.0300.01120.00370.10326.31.000.0160.054014.72.30.0110.0002c
648—10/25/01480.260.0350.00510.00170.10926.71.300.0410.005814.92.20.0020.0003c
Outlet—11/07/0143.0NA0.0290.00350.00120.12128.90.50 (0.433)0.007<0.01114.42.00.011<0.0001
    Avg0.240.0320.00480.00160.11727.80.920.0490.03714.72.10.0120.00008
  • a Quantification limits: DOC, 0.04 mM; TOC, 0.04 mM; acetate, 0.002 mM; formate, 0.002 mM; propionate, 0.001 mM; DIC, 0.04 mM; Cl, 0.003 mM; HS, 0.0004 mM; SO42−, 0.001; NH4+, 0.011 mM; Na, 0.004 mM; Ca, 0.001 mM; Mg, 0.002 mM; Fe, 0.0009 mM. TOC and DOC agree within the error. NA, not analyzed. NO3 and PO42− were at or below the quantification limits (0.002 and 0.00005 mM, respectively) for all samples.

  • b HS was determined by two different protocols, gravimetric measurement and measurement of Zn by IPC-AES after precipitation with ZnCl (values in parentheses) (see Materials and Methods).

  • c Below the high-confidence quantification limit, but detectable.