A brief overview of modern directions in marine DOC studies Part I.—Methodological aspects

Dafner, Evgeny V.; Wangersky, Peter J.

doi:10.1039/b107277n

Cited by 33 publications

(12 citation statements)

References 59 publications

(92 reference statements)

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“…Dafner and Wangersky (2002) showed that special attention toward the cleanness of the sampling facilities and procedure is crucial. Dafner and Wangersky (2002) showed that special attention toward the cleanness of the sampling facilities and procedure is crucial.…”

Section: Interferencesmentioning

confidence: 99%

Sum Parameters: Potential and Limitations

Frimmel¹,

Abbt‐Braun²

2011

Treatise on Water Science

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Section: Interferencesmentioning

confidence: 99%

Sum Parameters: Potential and Limitations

Frimmel¹,

Abbt‐Braun²

2011

Treatise on Water Science

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“…What are the implications? First, as pointed out by Dafner and Wangersky [94], when using older DOC data, one should be aware that values are likely to be in the right neighborhood but with a greater variability than we would now accept. A typical range of error of the DOC measurements by a recent HTC apparatus is 1%-2% as a relative value, which corresponds to approximately 1/10 the error of the WCO method [95].…”

Section: Organic Carbon Concentration Measurementsmentioning

confidence: 99%

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Filella

Rodríguez-Murillo

2014

Water

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Many articles published in the last few years start with the assumption that the past decades have seen an increase in dissolved organic carbon (DOC) concentrations in the rivers and lakes of the Northern Hemisphere. This study analyses whether the existing evidence supports this claim. With this aim, we have collected published studies where long series of organic carbon concentrations (i.e., longer than 10 years) were analyzed for existing trends and have carefully evaluated the 63 articles found. Information has been collated in a comprehensive and comparable way, allowing readers to easily access it. The two main aspects considered in our analysis have been the analytical methods used and the data treatment methods applied. Both are sensitive issues because, on the one hand, the difficulties associated with correctly determining organic carbon concentrations in surface waters are well known, while, on the other, dealing with real environmental data (i.e., lack of normality, censoring, missing values, etc.) is an extremely intricate matter. Other issues such as data reporting and the geographical location of the systems studied are also discussed. In conclusion, it is clear that organic carbon concentrations have increased in some surface waters in the Northern Hemisphere since the 1990s. However, due to a lack of data in many parts of the world, it is not known whether this phenomenon is general and, more importantly, in the areas for which such data do exist, the reporting and methodological problems in the published studies prevent any conclusion on the existence of a general temporal behavior of organic carbon from being drawn.

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“…理想情况, DOM 样品应该是经孔径<0.2μm 的滤膜以去除滤液中细菌的干扰 [25] . 由于浮游藻类的分解, 在过滤过程中不可避免会在溶液中增加额外的 DOM [23] . 过滤应该在低压 [26] 或者是自然重力过滤 [27] .…”

Section: 它是细菌二次生产进入微食物网的主要物质来源根据研究目的可以用不同孔径的滤膜将它们分开用unclassified

Assessment of sample processing methods for stable isotope analysis of aquatic food webs

Zeng¹,

Kong²,

Zhang³

et al. 2008

Journal of Lake Sciences

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Stable isotope analysis is commonly used in studying flows of mass and energy through food webs and trophic relationships in aquatic ecosystems. However, different sample processing methods can influence the measurement of these stable isotope rates, which may result in errors in the resulting food web models and the comparing results between different studies. In particular, errors may result from four different sources, that is, preservation, separation, acidification and dehydration. The collectted particulate/dissolved organic matter, bacteria, zooplankton, algae, hydrophyte, fish and zoobenthos were rinsed with de-ionized water to clean off epibionts, and then stored at −20℃. Acidification by adding 1mol/L HCl drop-by-drop was needed for carbon isotope analysis in samples of sediment organic matter, invertebrates with calcareous structures, and plankton. For nitrogen analysis, acidification should be avoided. Finally, dehydration was required by the analytical methods used in the determination of isotopic abundance. Both freeze-drying and drying at 40−70℃ were acceptable. In addition, materials preserved with formalin and ethanol stocks was suitable for current ecological applications of isotopic analysis and open up the possibility to reconstruct food webs and biogeochemical changes at scales of tens or hundreds of years. In this review we summarize different sample processing prior to the analytical determination of stable isotope ratios and the influence mechanism of some processing methods, which are fundamental for further methodology research.

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A brief overview of modern directions in marine DOC studies Part I.—Methodological aspects

Cited by 33 publications

References 59 publications

Sum Parameters: Potential and Limitations

Sum Parameters: Potential and Limitations

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Assessment of sample processing methods for stable isotope analysis of aquatic food webs

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