Sample Requirements for Sr-Nd-Hf

The isotopic ratios 87Sr/86Sr, 143Nd/144Nd, and 176Hf/177Hf can be measured in various sample types such as igneous and metamorphic rocks, mineral dust, and marine and lacustrine sediments. The following recommendations are general guidelines which help us to provide better service to our customers. Individual sample size requirements largely vary based on the sample type. We always recommend that you choose the best samples for your research objectives. Please feel free to contact us for advice if you are concerned that your samples are too small.

Mineral Dust (ashed) – 30 to 50 mg: Aerosol samples collected on filter paper must be ashed entirely prior to submittal. All organics must be removed from the sample either by ashing or with hydrogen peroxide. All carbonate fractions must be removed if you wish to measure Sr-Nd- Hf isotopes only on siliciclastic fraction. A larger sample size is required if we need to remove the carbonates and organics or ash the samples. For effective sample dissolution, high-temperature flux fusion is the method of choice. Aerosol samples will be fused at 1075°C with high-purity lithium metaborate (LiBO2, Puratronic) and ultra-pure grade lithium bromide to ensure complete recovery of the melt. The melt is directly digested in 6 M nitric acid. Sr-Nd-Hf isotope measurements can be conducted on smaller sample sizes, please consult the lab before submitting samples.

Marine and lacustrine sediments – 50 mg: All organics must be removed from the sample either by ashing or with hydrogen peroxide. All carbonate fractions must be removed if you wish to measure Sr-Nd-Hf isotopes only on siliciclastic fraction. A larger sample size is required if we need to remove the carbonates and organics from the samples. For effective sample dissolution, high-temperature flux fusion is the method of choice. Sediment samples will be fused at 1075°C with high-purity lithium metaborate (LiBO2, Puratronic) and ultra-pure grade lithium bromide to ensure complete recovery of the melt. The melt is directly digested in 6 M nitric acid. Sr-Nd-Hf isotope measurements can be conducted on smaller sample sizes, please consult the lab before submitting samples.

Igneous Rocks – 50 mg: Rock samples need to be homogenized prior to submittal. For effective sample dissolution, high-temperature flux fusion is the method of choice. Homogenized samples will be fused at 1075°C with high-purity lithium metaborate (LiBO2, Puratronic) and ultra-pure grade lithium bromide to ensure complete recovery of the melt. The melt is directly digested in 6 M nitric acid. Sr isotope measurements can be conducted on smaller sample sizes, please consult the lab before submitting samples.

Contact the lab for additional information on sample submission.

Note: Send sample in glass/plastic vials or in a ziplock bag with proper labeling. DO NOT wrap samples in aluminum or any metal foil. Use weighting paper if you need to wrap your samples.