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Microfibres from clothes laundering are the main source of primary microplastics in oceans. Fibres are frequently the most common plastics found in aquatic animals. The main plastic in polluting microplastics is PET. Various toxic substances are incorporated in textile microfibres. Fibres contribute up to 90% total plastic mass in wastewater treatment plants. A Standard Test is required to allow the development of microfibre release control actions.

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Guanabara Bay, located in Rio de Janeiro state. It is surrounded by the second most important metropolitan area of the country. Over recent decades, land disturbance and urbanization in the surrounding area has significantly increased sediment input to the bay and had a negative effect on its overall environmental. This is especially related to high volumes of untreated sewage and industrial effluents. This study evaluates the history of this human impact through detailed examination of a sediment core taken from the northern portion of Guanabara Bay. A geochronology is established using 210 Pb dating and related to organic carbon and heavy metal fluxes to the sediments. This gave a calculated net average sedimentation rate for the core of 0.67 cm.year -1 . The organic carbon and heavy metals flux started to increase at the beginning of the last century and the highest values was observed in the top of the cores.