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RXSOL Sodium Thiosulfate Pentahydrate is a water-soluble reducing agent used for the neutralization of residual chlorine and other suitable oxidizing disinfectants in marine ballast water treatment applications.
DUBI CHEM RXSOL supplies marine chemicals, ballast water treatment chemicals and industrial water treatment products to shipping companies, ship chandlers, vessel operators and marine engineering companies across the UAE, Oman, Saudi Arabia, Qatar, Bahrain, Kuwait and India.
Sodium Thiosulfate Pentahydrate is particularly relevant to electro-chlorination and other oxidant-based Ballast Water Management Systems (BWMS) where residual oxidants must be neutralized before treated ballast water is discharged.
Sodium Thiosulfate commonly used in Dechlorination of municipal wastewater, pulp & paper, power, and textile water treatment plants and as an Oxygen scavenger in oil well drilling process in Mining industries. Also chemically suitable for Aluminium cation reaction.
Sodium Thiosulfate used as a Pond / Aquarium Dechlorinator. But Sodium Thiosulfate does not treat for Chloramine, only Chlorine. Chloramine is a chemical compound composed of chlorine and ammonia and more and more utilities are converting to its use. Check with your municipal water company to learn which chemical they are using. If Chloramine is the disinfectant, please research other knowledgeable sources to learn your best solution for water treatment.
Molecular Formula ::: Na2S2O3 - 5H2O
This product also used as a Photography as a fixing agent (hypo) to dissolve unchanged silver salts from exposed negatives.
Many marine ballast water treatment systems use electro-chlorination or other oxidizing technologies to control aquatic organisms and microorganisms in ballast water.
These systems generate or introduce oxidizing agents that provide disinfection during ballast water treatment.
However, residual oxidants remaining in the treated ballast water may require neutralization before discharge.
Sodium Thiosulfate Pentahydrate acts as a reducing agent, helping convert residual chlorine and suitable oxidants into less reactive compounds.
This process is known as ballast water dechlorination or neutralization.
The required neutralization procedure depends on the BWMS manufacturer's instructions, the oxidant concentration and the vessel's approved operating procedures.
Sodium Thiosulfate Anhydrous can be used for:
Ballast water dechlorination
Residual chlorine neutralization
Electrochlorination BWMS
Sodium hypochlorite-treated ballast water
Oxidizing biocide neutralization
Ballast water discharge preparation
Marine water-treatment systems
Sodium thiosulfate functions as a reducing agent. It reacts with residual oxidizing species and converts them into less oxidizing chemical species.
In a chlorine-treated ballast water system, sodium thiosulfate can consume residual chlorine, helping reduce the Total Residual Oxidant (TRO) concentration before discharge.
The required dosage depends on:
Initial TRO concentration
Ballast water volume
BWMS technology
Water chemistry
Required discharge residual
Chemical concentration
Reaction/contact time
Dosing-system configuration
Therefore, dosing should be calculated based on the actual BWMS operating parameters rather than using a universal fixed dosage.
For complete oxidation of thiosulfate to sulfate by chlorine, the theoretical chemical demand is approximately:
0.875 mg of pure Sodium Thiosulfate Pentahydrate per 1 mg of chlorine expressed as Cl₂ equivalent.
For example, with 1,000 m³ of ballast water containing 2 mg/L residual oxidant expressed as Cl₂:
|
Parameter |
Value |
|---|---|
|
Ballast Water Volume |
1,000 m³ |
|
TRO Concentration |
2 mg/L as Cl₂ |
|
Theoretical Pure Chemical Requirement |
Approximately 1.75 kg |
|
Chemical Purity |
99% |
|
Purity-Adjusted Theoretical Requirement |
Approximately 1.77 kg |
Important: This is an illustrative chemical stoichiometry calculation, not a recommended shipboard dosage. Thiosulfate may follow different reaction pathways, and actual demand can differ substantially. The approved BWMS neutralization chemical, dosing algorithm and TRO feedback controls must govern practical use.
The required quantity of Sodium Thiosulfate should be determined from the actual TRO measurement and BWMS dosing requirements. Overdosing or underdosing can affect ballast-water treatment performance and discharge conditions.
For shipboard operation, dosing should therefore be controlled through the vessel's approved BWMS procedures, TRO monitoring system, and chemical-dosing equipment.
Many Ballast Water Management Systems (BWMS) use an oxidizing treatment process to control organisms in ballast water. Depending on the technology, treatment may generate or introduce free chlorine, hypochlorite, or other oxidizing residuals.
Before discharge, residual oxidant may need to be neutralized.
Sodium Thiosulfate Anhydrous can be dosed into the treated ballast water to reduce residual oxidizing compounds.
This makes it an important chemical for selected ballast-water neutralization systems.
Because the anhydrous grade does not contain water of crystallization, it provides a higher chemical concentration by weight compared with hydrated grades.
It is widely used as a reducing agent for residual chlorine and hypochlorite neutralization.
The solid can be dissolved in water to prepare a dosing solution suitable for compatible chemical dosing systems.
Sodium thiosulfate is used in selected marine and ballast-water treatment applications where residual oxidants must be neutralized before discharge.
Sodium thiosulfate is available in different hydration states.
Sodium Thiosulfate Anhydrous:
Na₂S₂O₃
Sodium Thiosulfate Pentahydrate:
Na₂S₂O₃·5H₂O
The two grades should not automatically be substituted on a kilogram-for-kilogram basis because their molecular weights and active chemical concentrations differ.
When changing between grades, the dosing calculation should be adjusted according to the required molar or active-chemical concentration.
Sodium Thiosulfate Anhydrous should be stored in a cool, dry and well-ventilated location in tightly closed packaging. Protect the product from moisture and contamination.
Appropriate personal protective equipment should be used during handling and preparation of dosing solutions. Always consult the latest Safety Data Sheet (SDS) and the BWMS manufacturer's operating instructions.
Sodium Thiosulfate Anhydrous is an important reducing chemical for selected ballast water treatment systems, particularly where chlorine or other oxidizing disinfectants are used. Its ability to neutralize residual oxidants makes it valuable for ballast water dechlorination and discharge preparation.
For marine operators requiring Sodium Thiosulfate Anhydrous for Ballast Water Treatment, a consistent-quality product, correct dosing calculation, proper storage, and compatibility with the vessel's BWMS are essential for effective and compliant operation.
Sodium Thiosulfate reacts with residual chlorine species in ballast water, reducing their oxidizing activity.
In a simplified reaction with free chlorine:
This is one possible oxidation pathway under particular reaction conditions. Actual reaction products and chemical demand depend on pH, oxidant chemistry and operating conditions.
In marine applications, treatment performance is generally assessed using Total Residual Oxidant (TRO) measurements rather than free chlorine alone.
The dosage of Sodium Thiosulfate Pentahydrate depends on:
Total Residual Oxidant (TRO) concentration
Ballast water volume
Chemical purity
Seawater chemistry and pH
Required reaction time
BWMS manufacturer specifications
Approved discharge limits
Sodium Thiosulfate Pentahydrate may be used in:
Compatible electro-chlorination ballast water management systems
Residual chlorine neutralization
Marine water treatment processes
Industrial water dechlorination
Chlorinated wastewater treatment
Water sampling and analytical procedures
Chemical neutralization systems
Not every BWMS permits sodium thiosulfate. Some systems specify sodium sulfite, sodium bisulfite or another neutralizing agent. Chemical substitution must be approved by the BWMS manufacturer and consistent with the vessel's type-approved system documentation.
DUBI CHEM RXSOL serves marine chemical requirements across major UAE shipping and industrial locations.
Dubai: Jebel Ali Port, Dubai Maritime City and surrounding marine service areas.
Fujairah: Fujairah Port, Fujairah Anchorage and marine supply operations.
Sharjah: Hamriyah Port, Hamriyah Free Zone and industrial marine facilities.
Abu Dhabi: Khalifa Port, Mussafah, Ruwais and offshore support operations.
Other Locations: Ajman, Ras Al Khaimah and Khor Fakkan.
RXSOL supports ballast water treatment chemical enquiries for vessels and marine contractors operating in Sohar Port, Muscat, Salalah and Duqm.
Customers should provide the BWMS manufacturer, model, approved neutralizer specification, required chemical quantity and vessel delivery schedule.
RXSOL serves marine chemical procurement requirements across important Indian ports, including Mumbai, JNPT, Kolkata, Haldia, Chennai, Ennore, Visakhapatnam, Kandla, Mundra and Kochi.
The product is relevant to shipping companies and marine service providers operating compatible oxidant-based ballast water treatment systems.
Q1. Why is Sodium Thiosulfate used in ballast water treatment?
It acts as a reducing agent to neutralize residual chlorine and other compatible oxidants before ballast water discharge.
Q2. Can Sodium Thiosulfate Pentahydrate reduce TRO in ballast water?
Yes. It can reduce residual oxidants in suitable treatment systems, subject to the oxidant chemistry and approved dosing procedure.
Q3. Is Sodium Thiosulfate suitable for every ballast water treatment system?
No. It is only appropriate where the BWMS manufacturer permits its use. UV-based systems, for example, generally do not require chemical neutralization unless another oxidant is involved.
Q4. Can Sodium Thiosulfate replace Sodium Sulfite in a BWMS?
Not automatically. The chemicals have different molecular weights and reaction characteristics. Substitution requires manufacturer approval and recalculation of the dosing system.
Q5. Where can I buy Sodium Thiosulfate Pentahydrate for marine ballast water treatment?
Contact DUBI CHEM RXSOL for specifications, availability and quotations for UAE, Oman, India and other regional port destinations.
For marine chemical enquiries, contact the RXSOL team with the required chemical grade, quantity, destination port and BWMS details.
Websites: DUBI CHEM | RXSOL Marine Chemicals | Oman Chemical Supply
For shipowners, ship managers, BWMS operators, marine chemical distributors, and vessel-management companies, selecting a consistent-quality Sodium Thiosulfate Anhydrous supplier is important for reliable neutralization performance.
When purchasing the product, customers should verify:
Chemical purity
Anhydrous specification
Batch consistency
COA
SDS
Packaging
Solubility
Storage requirements
Bulk availability
Compatibility with the BWMS dosing system
Chlorine control, Declor-it, Disodium thiosulfate, S-hydril, Sodium hyposulfite, Sodium oxide sulfide, Antichlor, Sodothiol, Sulfothiorine, Ametox
RXSOL Sodium Thiosulfate Pentahydrate for residual chlorine and TRO neutralization in compatible marine ballast water treatment systems. DUBI CHEM marine chemical supplier in Dubai, Fujairah, Sohar and India.
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RXSOL Sodium Thiosulfate Pentahydrate marine chemical for residual oxidant neutralization in ballast water management systems supplied by DUBI CHEM UAE.
Effective reducing agent for residual chlorine neutralization
Suitable for compatible oxidant-based ballast water treatment systems
Highly soluble in water
Can be prepared as an aqueous chemical dosing solution
Helps reduce Total Residual Oxidant (TRO) concentrations
Supports controlled ballast water discharge procedures
Suitable for industrial and marine water treatment applications
Convenient crystalline form for storage and chemical solution preparation
Muscat, Salalah, Sohar, Duqm, Rustaq, Barka, Sanaiya, Sur, Seeb, Shinas, Nizwa, Oman, Bahrain, Abu Dhabi, Ajman, Al Ain, Dubai, Ras Al-Khaimah, Fujairah, Sharjah, Umm Al Quwain, Ruwais, Khalifa Port, Jebel Ali, DP WORLD, and all UAE ports...
