Micromass PRISM III stable-isotope mass spectrometer

Homogenised 5-yearly growth intervals using a stainless steel drill tip on a moveable stage. Powders for trace element analysis were rinsed and then treated with concentrated hydrogen peroxide for 15 min and subsequently rinsed and oven dried. Isotopic powders were not pre-treated with hydrogen peroxide. Isotopes calibrated against an internal lab standard, NBS 18 & NBS 19 and calculated relative to Pee Dee Belemnite. Reproducibility: d13C = 014 permil.

Homogenised 5-yearly growth intervals using a stainless steel drill tip on a moveable stage. Powders for trace element analysis were rinsed and then treated with concentrated hydrogen peroxide for 15 min and subsequently rinsed and oven dried. Isotopic powders were not pre-treated with hydrogen peroxide. Isotopes calibrated against an internal lab standard, NBS 18 & NBS 19 and calculated relative to Pee Dee Belemnite. Reproducibility: d18O = 0.1 permil.

Homogenised 5-yearly growth intervals using a stainless steel drill tip on a moveable stage. Powders for trace element analysis were rinsed and then treated with concentrated hydrogen peroxide for 15 min and subsequently rinsed and oven dried. Isotopic powders were not pre-treated with hydrogen peroxide. Isotopes calibrated against an internal lab standard, NBS 18 & NBS 19 and calculated relative to Pee Dee Belemnite. Reproducibility: MgCa = 0.75%.

Homogenised 5-yearly growth intervals using a stainless steel drill tip on a moveable stage. Powders for trace element analysis were rinsed and then treated with concentrated hydrogen peroxide for 15 min and subsequently rinsed and oven dried. Isotopic powders were not pre-treated with hydrogen peroxide. Isotopes calibrated against an internal lab standard, NBS 18 & NBS 19 and calculated relative to Pee Dee Belemnite. Reproducibility: Mn = 44.72%.

Homogenised 5-yearly growth intervals using a stainless steel drill tip on a moveable stage. Powders for trace element analysis were rinsed and then treated with concentrated hydrogen peroxide for 15 min and subsequently rinsed and oven dried. Isotopic powders were not pre-treated with hydrogen peroxide. Isotopes calibrated against an internal lab standard, NBS 18 & NBS 19 and calculated relative to Pee Dee Belemnite. Reproducibility: SrCa = 0.22%.