: Preposition for 'point of investigation' We have sampling points where we take water samples from a river. We define them as points of investigation (e.g abb. P1) and use always 'concentrations

@Shelley992

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We have sampling points where we take water samples from a river. We define them as points of investigation (e.g abb. P1) and use always 'concentrations in the P1' as the point is located in the river. But this sounds somehow strange to me. Is that the proper preposition in such situation?

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