Registration Dossier
Registration Dossier
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EC number: 231-665-7 | CAS number: 7681-38-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Sodium hydrogensulfate readily dissociates in water to sulfate, and sodium and hydrogen ions. Production: production of sodium sulfate is 4.6 million tonnes/year (1999), of which approximately 50% a by product of the chemical industry and the remainder is extracted from natural deposits. Due both sodium as well as sulfate ions occurr naturally. Sodium is present ubiquitously in the environment, and is essential to all forms of life, and is nor discussed further for this reason. The sulfate ion forms part of the natural sulfur cycle. It is readily utilised by bacteria, fungi and many aerobic and anaerobic prokaryotic species. A summary of the potential pathways involved in the cycle of sodium sulfate are shown below. Reference (OECD SIDS 2005) (The sulfur Cycle Microbiology Prescott Harley and Klein 1996) (College of Biological sciences 1993)
Key value for chemical safety assessment
Additional information
Sodium hydrogensulfate:
Sodium hydrogensulfate readily dissociates in water to sulfate, sodium and hydrogen ions, which are not subject to biological degradation in view of their inorganic nature. However, sulfate occurs naturally and is part of the natural sulfur cycle, in turn being readily utilised by bacteria, fungi and many aerobic and anaerobic prokaryotic species. A summary of the potential pathways involved in the cycle of sodium sulfate are given in the summary (Reference: OECD SIDS 2005) (The sulfur Cycle Microbiology Prescott Harley and Klein 1996; College of Biological sciences 1993).
Sodium sulfate:
Microbes play pivotal roles in the sulfur cycle. In the case of sulfate, it provides microorganisms with the possibility of carrying out sulfate reduction to derive their energy. Sulfate is used as an electron acceptor to form sulfide (H2S). This is a process known as dissimilatory reduction and occurs anaerobically. Alternativelythe reduction of sulfate for use in amino acid syntheses for example can also occur and is known as assimilatory reduction forming organic sulfur. Other microorganisms may reduce to elemental sulfur even further. Sulfite is also a critical intermediate that can be reduced to sulfide as well as re-oxidised to sulfate, completing the cycle.
Some species commonly associated with these steps are:
Aerobic sulfur oxidation - occurs inThiobacillus Beggiatoa and Thiothrix sp
Anaerobic sulfur oxidation - occurs inChlorobium and Chromatum and Desulfovibria sp
Sulfur reduction - occurs in Alteromonas, Clostridium sp
Summary written using data obtained from (The sulfur Cycle Microbiology Prescott Harley and Klein 1996)
A schematic representation of the sulfur cycle can be found on (http: //www. lenntech. com/sulfur-cycle. htm).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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