Fast and green separation of malachite green in water samples by micro-dispersion scanometry method without heating, cooling and organic solvents at room temperature

•Very trace level of Ni(OH)2 nanopowder is able to remove malachite green effectively.•Dispersive method can be done at room temperature without cooling and heating processes by salting out.•Sacanometry is a good alternative for UV–vis detector in dispersive method.•In micro level of reagents includ...

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