Toxicological Impacts of Synthetic Dyes in Aquatic Systems

Synthetic dyes, notably azo, anthraquinone and triarylmethane classes, represent a major group of industrial pollutants entering waterways through textile, paper and leather effluents. Their structural diversity and persistence under environmental conditions confer varying degrees of toxicity, ranging from acute lethality in planktonic organisms to chronic sublethal effects such as endocrine disruption, genotoxicity and behavioural impairments in fish and invertebrates. Dye molecules may adsorb to suspended solids, bioaccumulate in aquatic biota and undergo reductive cleavage to form aromatic amines, many of which are carcinogenic or mutagenic. The combined action of oxidative stress, membrane disruption and interference with metabolic enzymes underpins observed effects on growth, reproduction and survival across trophic levels. Geographical hotspots of contamination are often linked to textile manufacturing hubs in Asia and South America, where treatment infrastructure is limited. Advances in monitoring techniques have improved detection of trace dyes and metabolites, while emerging treatment strategies—encompassing adsorption, advanced oxidation and bioremediation—offer promising routes for effluent detoxification. Understanding both toxic mechanisms and removal efficacy is crucial for implementing effective regulatory standards, safeguarding aquatic biodiversity and securing water quality for human and ecological health.

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Toxicological Impacts of Synthetic Dyes in Aquatic Systems publication trend

The graph below shows the total number of articles in toxicological impacts of synthetic dyes in aquatic systems across all publications each year (not limited to Nature Index journals).

Technical terms

Azo dye: Synthetic organic dye characterised by one or more azo (–N=N–) functional groups linking aromatic systems.

EC50: Effective concentration at which 50% of a test population exhibits a defined adverse effect.

NOAEC: No‐Observed‐Adverse‐Effect Concentration; the highest exposure level at which there are no significant toxic effects.

Adsorption isotherm: Mathematical relationship describing how solutes partition between liquid and solid phases at equilibrium.

Photodegradation: Decomposition of chemical compounds upon absorption of light, often generating reactive intermediates.

References

1. Anionic azo dyes and their removal from textile wastewater through adsorption by various adsorbents: a critical review. Frontiers in Environmental Engineering (2024).
2. Quantification of twenty pharmacologically active dyes in water samples using UPLC-MS/MS. Heliyon (2022).
3. Assessing the effects of textile leachates in fish using multiple testing methods: From gene expression to behavior. Ecotoxicology and Environmental Safety (2020).
4. Survey on hazardous non-regulated aromatic amines as cleavage products of azo dyes found in clothing textiles on the Swiss market. Journal of Consumer Protection and Food Safety (2019).