The DOI matches its Crossref record; 9 of the 9 references it cites were found in a registry or an index.
Measuring –NH4+ in marine, estuarine and fresh waters: An adaptation of the ammonia diffusion method for samples with low ammonium concentrations
Open accessAbstract
We present a method for measuring 15N–NH4+ in marine, estuarine and fresh waters. The advantage of this method is that it is broadly applicable to all types of water and it allows measurements in samples with lower ammonium concentrations than has previously been possible. The procedure is a modification of the ammonia diffusion method and uses large sample volumes (often 4 l) to obtain sufficient N for isotope ratio mass spectrometric analysis. Large volume samples have not previously been used with the diffusion procedure because isotopic fractionation occurs due to incomplete recovery of ammonium. However, the method we present accounts for this fractionation and allows precise correction of measured δ15N values.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
STABLE ISOTOPES IN ECOSYSTEM STUDIES
Peterson, B. J., & Fry, B. (1987) · Annual Review of Ecology and Systematics · doi:10.1146/annurev.es.18.110187.001453 · Cited by 5,406
Self-citationMariotti, A., Germon, J. C., Hubert, P., Kaiser, P., Letolle, R., Tardieux, A., & Tardieux, P. (1981) · Plant and Soil · doi:10.1007/bf02374138 · Cited by 1,735
Diffusion Method To Prepare Soil Extracts For Automated Nitrogen‐15 Analysis
Brooks, P. D., Stark, J. M., McInteer, B. B., & Preston, T. (1989) · Soil Science Society of America Journal · doi:10.2136/sssaj1989.03615995005300060016x · Cited by 684
Sigman, D. M., Altabet, M. A., Michener, R., McCorkle, D. C., Fry, B., & Holmes, R. M. (1997) · Marine Chemistry · doi:10.1016/s0304-4203(97)00009-1 · Cited by 470
Self-citationSørensen, P., & Jensen, E. S. (1991) · Analytica Chimica Acta · doi:10.1016/0003-2670(91)87215-s · Cited by 197
Aminot, A., Kirkwood, D. S., & Kérouel, R. (1997) · Marine Chemistry · doi:10.1016/s0304-4203(96)00080-1 · Cited by 160
Fry, B., Garritt, R. H., Tholke, K., Neill, C., Michener, R. H., Mersch, F. J., & Brand, W. A. (1996) · Rapid Communications in Mass Spectrometry · Cited by 41
Self-citationRoutine Measurement of Dissolved Inorganic 15N in Precipitation and Streamwater
Downs, M. R., Michener, R. H., Fry, B., & Nadelhoffer, K. J. (1999) · Springer eBooks · doi:10.1007/978-94-017-3241-3_10 · Cited by 25
Self-citationA Comparison of Diffusion and Distillation Methods for Preparing Samples for 15N Analyses
Adamsen, F. J., & Reeder, J. (1983) · Soil Science Society of America Journal · doi:10.2136/sssaj1983.03615995004700030047x · Cited by 16
Cited by
A simple and precise method for measuring ammonium in marine and freshwater ecosystems
Holmes, R. M., Aminot, A., Kérouel, R., Hooker, B., & Peterson, B. J. (1999) · Canadian Journal of Fisheries and Aquatic Sciences · doi:10.1139/cjfas-56-10-1801 · Cited by 1,376
Self-citationQuantification of the nitrogen cycle in a prairie stream.
Dodds, W. K., Evans-White, M. A., Gerlanc, N. M., Gray, L., Gudder, D. A., Kemp, M. J., López, A. L., Stagliano, D., Strauss, E. A., Tank, J. L., et al. (2000) · Ecosystems · doi:10.1007/s100210000050 · Cited by 154
Tamborski, J. J., Cochran, J. K., & Bokuniewicz, H. J. (2017) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2017.09.003 · Cited by 58
Metadata
- Authors
- Holmes, R. M., McClelland, J. W., Sigman, D. M., Fry, B., & Peterson, B. J.
- Venue
- Marine Chemistry
- Publisher
- Elsevier BV
- Published
- 1998-04
- Volume
- 60
- Issue
- 3-4
- Pages
- 235-243
- ISSN
- 0304-4203 (ISSN-L)
- OpenAlex
- W1984109478
- Cited by
- 366
- References
- 9
- FWCI
- 8.95
- Type
- journal article
- Language
- en
- Open access
- hybrid
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Measuring –NH4+ in marine, estuarine and fresh waters: An adaptation of the ammonia diffusion method for samples with low ammonium concentrations. https://app.cochat.ai/papers/10.1016/s0304-4203(97)00099-6
- The paper
- Holmes, R. M., McClelland, J. W., Sigman, D. M., Fry, B., & Peterson, B. J. (1998). Measuring –NH4+ in marine, estuarine and fresh waters: An adaptation of the ammonia diffusion method for samples with low ammonium concentrations. Marine Chemistry. https://doi.org/10.1016/s0304-4203(97)00099-6
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
