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Chemical oxygen demand(standard sample),46.2mg/L, 20ml
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Chemical oxygen demand(standard sample),23.2mg/L, 20ml
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Chemical oxygen demand standard solution,10000μg/mL, 100ml
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Chemical oxygen demand standard solution,4000μg/mL, 100ml
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Chemical oxygen demand standard solution,2500μg/mL, 100ml
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Chemical oxygen demand standard solution,1500μg/mL, 100ml
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Total hardness of water(standard sample)(in terms of calcium carbonate),27.8mg/L, matrix: H2O, 20ml
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Chemical oxygen demand(standard sample),176mg/L, 20ml
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Chemical oxygen demand(standard sample),275mg/L, 20ml
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Chemical oxygen demand(standard sample),496mg/L, 20ml
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Chemical oxygen demand(standard sample),746mg/L, 20ml
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