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Table T14. Color measurements (absorbance) of interstitial waters, Site U1427.

Core, section,
interval (cm)		 Top depth
CSF-A (m)
Sample		 Alkalinity
(mM)		 Absorbance 375 nm Absorbance 325 nm Absorbance 277 nm
B1 B2/3 B1 B2/3 B1 B2/3
346-U1427A-
1H-1, 0 0.00 ML 2.45   0.003   0.004   0.122
1H-2, 65–70 1.56 IW-Sq 15.92 0.076 0.078 0.184 0.183 2.455 2.542
2H-1, 145–150 3.25 IW-Sq 34.16 0.191 0.106 0.423 0.521 3.878 10.530
2H-4, 145–150 7.75 IW-Sq 56.73   0.198   0.541   4.125
3H-1, 145–150 12.75 IW-Sq 70.90   0.383   0.883   5.050
3H-4, 143–148 17.16 IW-Sq 80.74 0.276 0.271 0.773 0.927 4.201 6.897
4H-2, 145–150 22.76 IW-Sq 91.99   0.303   0.882   6.289
4H-5, 132–137 26.45 IW-Sq 99.54 0.330 0.317 0.955 0.927 4.192 6.897
5H-1, 145–150 31.75 IW-Sq 101.95   0.354   1.047   7.549
6H-2, 146–151 41.61 IW-Sq 112.53   0.302   0.914   7.448
7H-2, 141–146 51.37 IW-Sq 112.09            
8H-2, 139–144 60.59 IW-Sq 116.50   0.344   1.040   8.771
9H-2, 137–142 70.19 IW-Sq 121.17   0.363   1.144   9.299
12H-1, 145–150 98.25 IW-Sq 114.48 0.450   1.234   4.334  
15H-2, 140–145 127.14 IW-Sq 117.07   0.329   1.052   9.863
18H-2, 145–150 155.70 IW-Sq 118.49   0.429   1.162   10.121
21H-2, 140–145 185.20 IW-Sq 123.30            
22H-4, 150–155 197.65 IW-Sq 125.05   0.288   0.993   10.072
24H-1, 140–145 212.20 IW-Sq 127.16   0.263   0.938   9.890
28H-1, 123–128 239.33 IW-Sq 129.47 0.294 0.301 1.057 1.066 4.214 10.575
34H-2, 121–126 267.90 IW-Sq 127.66 0.303   1.124   4.207  
41H-2, 86–91 300.71 IW-Sq 130.87 0.260 0.256 0.965 0.960 4.233 10.460
47H-2, 95–100 328.70 IW-Sq 132.17   0.238   0.910   10.389
52H-1, 140–145 352.30 IW-Sq 132.27   0.245   0.963   10.600
60H-2, 121–126 391.08 IW-Sq 112.82   0.180   0.726   9.964
60H-2, 121–126 391.08 IW-Sq 109.18            
66H-1, 108–113 417.78 IW-Sq     0.187   0.812   10.496
72H-2, 125–130 446.50 IW-Sq 97.37   0.167   0.746   10.306
79H-1, 140–145 478.90 IW-Sq 91.88 0.132 0.125 0.618 0.616 4.141 10.046
85X-2, 138–143 521.56 IW-Sq 71.40   0.126   0.574   10.029
87X-1, 140–145 540.30 IW-Sq 79.14            
346-U1427B-
1H-1, 0 0.00 IW-Rh 2.43            
1H-1, 10–11 0.10 IW-Rh 3.42   0.032   0.067   0.275
1H-1, 30–31 0.30 IW-Rh 4.38   0.018   0.034   0.251
1H-1, 50–51 0.50 IW-Rh 6.01            
1H-1, 80–81 0.80 IW-Rh 8.50   0.032   0.074   0.754
1H-1, 120–121 1.20 IW-Rh 11.79   0.044   0.116   1.254
1H-2, 30–31 1.80 IW-Rh 17.34   0.072   0.189   2.638
1H-2, 80–81 2.30 IW-Rh 21.34            
1H-2, 120–121 2.70 IW-Rh 25.80   0.119   0.280   4.433
1H-3, 30–31 3.30 IW-Rh 32.05   0.130   0.338   5.394
1H-3, 80–81 3.80 IW-Rh 36.45   0.140   0.377   6.798
1H-4, 30–31 4.30 IW-Rh 41.30   0.158   0.422   7.059
2H-1, 30–31 5.10 IW-Rh 47.59   0.167   0.455   7.487
2H-1, 80–81 5.60 IW-Rh 48.34            
2H-1, 120–121 6.00 IW-Rh 49.10            
2H-2, 30–31 6.60 IW-Rh 52.71            
2H-2, 80–81 7.10 IW-Rh 54.47   0.167   0.498   6.479
2H-2, 120–121 7.50 IW-Rh 55.38   0.185   0.524   6.155
2H-3, 40–41 8.20 IW-Rh 57.32   0.197   0.551   5.815
2H-3, 100–101 8.80 IW-Rh 59.27   0.192   0.560   5.447

ML = mudline, IW-Sq = interstitial water from whole-round squeezing, IW-Rh = interstitial water from Rhizons. Samples were examined in three batches over 14 days after drilling to evaluate precision in absorbance measurements with regard to time and dilution. Batch 1 comprises undiluted samples examined 3–4 days after recovery. Batches 2 and 3 are samples diluted 2:1 with deionized water and examined 11–14 days after recovery. Measured absorbance values for Batches 2 and 3 (combined) have been multiplied by 3. However, there is a problem with such treatment concerning measurements at 277 nm. The scaling of absorbance measurements for interstitial water samples at Site U1427 is nonlinear at this wavelength, perhaps because undiluted samples have a strong golden color.

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