Table AT2. Nitrogen concentrations and isotope compositions of sediments using varying pretreatments.

Core, section, interval (cm)	Pretreatment	N (ppm)	15Nair ()
170-1040C-
5R-4, 115–150	None	1903	5.5
	H2O rinsing	1530	9.2
	6-N HCl rinsing	1100	5.5
205-1254A-
5R-5, 50–90	None	1772	5.7
	H2O rinsing	1716	6.0
	6-N HCl rinsing	1227	5.8
6R-1, 121–162	None	1779	5.6
	H2O rinsing	1675	5.9
	6-N HCl rinsing	1295	5.4
7R-5, 34–74	None	1685	5.2
	H2O rinsing	1637	6.9
	6-N HCl rinsing	1212	5.2
8R-4, 0–45	None	1915	6.0
	H2O rinsing	1849	6.5
	6-N HCl rinsing	1558	6.1
10R-6, 0–40	None	1504	4.1
	H2O rinsing	1479	5.2
	6-N HCl rinsing	1108	4.1
12R-1, 101–141	None	1434	4.0
	H2O rinsing	1394	5.7
	6-N HCl rinsing	1002	4.0
13R-5, 65–109	None	1554	4.1
	H2O rinsing	1444	4.9
	6-N HCl rinsing	1127	4.0

Notes: Leg 205 samples were frozen onboard and sent frozen to Lehigh University. Leg 170 sample was air-dried and stored as a dried powder.