What is sodium percarbonate?
Sodium percarbonate (SPC) is an addition compound composed of sodium carbonate and hydrogen peroxide. It decomposes in water into sodium carbonate (Na₂CO₃) and hydrogen peroxide (H₂O₂), releasing reactive oxygen species. It is widely used in bleaching, cleaning, and disinfection.
You may be wondering: As a common industrial chemical, is sodium percarbonate harmful to the human body? This article will answer the question.
Is sodium percarbonate really toxic?
Sodium percarbonate itself is not a “highly toxic” substance, but it is a moderately toxic chemical with some irritation and oxidizing properties. Under normal use, its impact on the human body and the environment is minimal, but its strong oxidizing properties pose a corrosive and potential risk that should not be ignored. However, sodium percarbonate is not “non-toxic” and improper use or handling may cause harm.
Mechanism of Action of Sodium Percarbonate
Sodium percarbonate’s “toxicity” or harmfulness does not stem from its traditional biological toxins, but rather from its chemical properties:
Strong Oxidizing Property: This is the core characteristic of sodium percarbonate. When dissolved in water, sodium percarbonate releases hydrogen peroxide (hydrogen peroxide) and sodium carbonate. Hydrogen peroxide can oxidize (destroy) the cell structure of microorganisms, thereby achieving bleaching and disinfection. Similarly, it can oxidize (damage) the proteins and lipids of human skin and mucous membrane cells, causing irritation and corrosion.
Alkalinity: Its aqueous solution is moderately alkaline, which saponifies skin oils, disrupts the skin barrier, and exacerbates its irritation.
Therefore, its hazards are chemical corrosion and oxidative damage, rather than physiological toxicity.
Is sodium percarbonate harmful when used as a water treatment chemical?
As a water treatment chemical, sodium percarbonate is generally harmless to human health and the environment under normal use.
Besides being non-toxic, sodium percarbonate offers many advantages when used as a common bleach and disinfectant.
1. Non-toxic decomposition products and environmental friendliness
Sodium percarbonate rapidly decomposes in water into:
Sodium carbonate (Na₂CO₃): Weakly alkaline, commonly found in natural waters, and can be neutralized;
Hydrogen peroxide (H₂O₂): Rapidly decomposes into water and oxygen, leaving no residue;
Oxygen (O₂): Non-toxic and, in fact, helps oxygenate water.
Conclusion: Contains no persistent pollutants, does not bioaccumulate, and has no long-term toxicity to aquatic ecosystems.
2. Ecotoxicity Assessment: Low Toxicity
| Indicators | Data | Conclusion |
| Acute Toxicity to Fish | LC₅₀ > 70 mg/L (96 hours) | Low Toxicity |
| Acute Toxicity to Daphnia | EC₅₀ ≈ 4.9 mg/L (48 hours) | Moderately Low Toxicity |
| Toxicity to Algae | No significant inhibitory effect | Limited to no impact |
| Wastewater Treatment Plant Microorganisms | No inhibitory effect recorded | No impact on biological treatment systems |
What applications can sodium percarbonate be used for?
As a water treatment chemical, sodium percarbonate is essentially harmless to the environment and human health at recommended dosages and under normal operating conditions. It is not considered a toxic chemical and can be used in a variety of applications.
Drinking Water Treatment
It can be used for pre-oxidation, algae removal, and deodorization, but dosage should be controlled to avoid excessive alkalinity.
Wastewater Treatment
As an oxygenator or co-oxidant, it has no inhibitory effect on microorganisms and is safe for use.
Aquaculture
It is commonly used for oxygenation, bottom modification, decolorization, and deodorization. Its decomposition products are non-toxic and safe for fish and shrimp.
As long as proper protective measures (such as wearing gloves and glasses) are taken and mixing with incompatible substances (such as acids and chlorine-based products) is avoided, it is safe and reliable for both domestic and industrial use. Furthermore, its environmental friendliness is a major advantage over traditional chlorine-based and boron-containing bleaches.
Sodium percarbonate is not considered highly or acutely toxic and presents a low toxicological risk. Its primary hazards stem from its strong oxidizing and alkaline properties, which can cause chemical corrosion and irritation.
For industrial users, product grade, purity, active oxygen content, packaging and handling requirements should be confirmed before purchasing.
Check Sodium Percarbonate Specifications →
