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Appearance
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Dark blackish brown powder
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Identity (UV/VIS spectrum)
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Passes test
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Absorption maxima λmax. (buffer pH 12.2)
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634 - 640 nm
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Specific absorptivity A1%,1cm (λmax;0.0015%;buffer pH 12.2, calculated on dried substance)
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250-500
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Loss on drying (at 110°C)
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Max 10.0%
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Suitability (as indicator for metal titration)
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Passes test
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