How can I measure the amount of dissolved CO2 in water sample with high accuracy?

Standard Test Methods For Total And Dissolved Carbon Dioxide In Water

“Standard Test Methods for Total Dissolved Carbon Dioxide in Water” Annual Book of ASTM Standards. Philadelphia, PA: American Society of Testing and Materials. Current edition approved October 15, 1992.

ASTM D 513-88

This standard is issued under fixed designation D 513; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last re-approval. A superscript epsilon (€) indicates an editorial change since the last revision or re-approval.

Scopes*

1.1 These test methods provide for the measurement of total or dissolved carbon dioxide present as carbon dioxide (CO2), carbonic acid, bicarbonate ion, and carbonate ion in water: SectionsTest Method A (Gas Sensing Electrode)8 – 15Test Method B (CO2 Evolution, Coulometric Titration16 – 24

Carbon dioxide may also be detected from carbonates present in particulates in samples.

It is the user’s responsibility to ensure the validity of these test methods on waters of untested matrices.

This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.5 Several test methods were discontinued from this standard in 1988. Refer to Appendix XI for Historical Information.

Referenced Documents

ASTM Standards: D1066 Practice for Sampling Steam2 D1129 Definitions of Terms Relating to Water2 D1192 Specification for Equipment for Sampling Water and Steam2 D1193 Specification for Reagent Water2 D1293 Test Methods for pH of Water2 D2777 Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water2 D3370 Practices for Sampling Water2 E 200 Practice for Preparation, Standardization, and Storage of Standard Solutions for Chemical Analysis2

Definitions

3.1 For definitions of terms used in these test methods, refer to Definitions D 1129.

Significance and Use

Carbon dioxide is a major respiration product of plants and animals and a decomposition product of organic matter and certain minerals. The atmosphere averages about 0.04 volume percent of CO2. Surface waters generally contain less than 10 mg/L, except at local points of abnormal organic or mineral decomposition; however, underground water, particularly deep waters, may contain several hundred mg/L.

When dissolved in water, CO2 contributes significantly to corrosion of water-handling systems. This is particularly troublesome in steam condensate systems. Loss of CO2 from an aqueous system can disturb the carbonate equilibrium and result in calcite encrustation of confining surfaces. Scaling of water heaters is a good example. Because of the delicate balance between corrosion and encrustation tendencies, much care must be given to control of CO2 and related species in water systems. Recarbonation of municipal supplies during final stages of softening and amine neutralization of steam condensate are applied for these purposes.

Interferences

General – Carbon dioxide is easily lost from solution during transit and storage of samples. It also is possible for total CO2 concentration to increase after sampling due to solution of finely divided calcium carbonate as a result of temperature or pressure changes.

Purity of Reagents

Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. 3 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.

Unless otherwise indicated, references to water shall be understood to mean water conforming to Type I of Specification D 1193. Additionally, for those test methods requiring water free of CO2, refer to Section 8.2 of Practice E 200.

Best novel method to optimize 3D geometry and its fluid?

I have problem with cytotoxicity test of gemcitabine.how can i fix it?

What is the IC50 of Gemcitabine in HepG2 cell line?

In flow analysis in FLAC software, what is the reason for moving the model after the flow analysis in the earth dam?

Do any researcher have ideas for the best medical Phantom that could be employed in segmating 3D medical data?

I have problem with designing a primer for my gene,how can i fix it???

How can i clone a plasmid?

Is degenerate primers appropriate for real time pcr?

Why do i have band in negative control in ITS primer?

The data of maximum specific growth rate in the continuous biorector versus pH?

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

How to separate water from glycerol solvent in a solvent recovery vacuum distillation column?

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

Why is the sum of the elements in a row in a Q matrix equal to zero?

Does different dilution factors affect negatively on NH3 reading ?

How to compare 2 samples recruited with different sampling methods?

Can random sampling have inclusion criteria?

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

To date, according to health authorities, 30% of the population's diseases are initiated by drinking water pollution. Do you know this problem?