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Water quality - Determination of nitrate in water using small-scale sealed tubes - Part 2: Chromotropic acid colour reaction. Original standard BS ISO 23696-2-2023 in PDF full version. Additional info + preview on request

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Water quality - Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes - Part 1: Dimethylphenol colour reaction. Original standard BS ISO 23697-1-2023 in PDF full version. Additional info + preview on request

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Water quality - Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes - Part 2: Chromotropic acid colour reaction. Original standard BS ISO 23697-2-2023 in PDF full version. Additional info + preview on request

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Textiles. Determination of fineness of flax fibres. Permeametric methods. Original standard BS ISO 2370-2019 in PDF full version. Additional info + preview on request

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Wrought magnesium and magnesium alloys. Rolled plates and sheets. Original standard BS ISO 23700-2021 in PDF full version. Additional info + preview on request

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Optics and photonics. Laser and laser-related equipment. Photothermal technique for absorption measurement and mapping of optical laser components. Original standard BS ISO 23701-2023 in PDF full version. Additional info + preview on request

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