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This document specifies methods of the determination of divalent copper ions (Cu2+)，divalent manganese ions (Mn2+)，and hexavalent chromium ions ［Cr(Ⅵ)］ in aqueous solution using an ultraviolet-visible spectrophotometer.
This document is applicable for the determination of divalent copper ions (Cu2+)，divalent manganese ions (Mn2+) and hexavalent chromium ions ［Cr(Ⅵ)］ in aqueous solution. The soil，food or biological samples can also be measured according to this document after proper treatment.
The detection limits of each ion in aqueous solution to be applied to this document are as follows:the content of Cu2+ is not less than 1.00×10-7 mol/L，the content of Mn2+ is not less than 1.00×10-6 mol/L，and the content of Cr(Ⅵ) is not less than 4.00×10-7 mol/L.
The pH ranges of water samples to be applied to this document are as follows:the pH range of aqueous solutions containing Cu2+ is 2-6，the pH range of aqueous solutions containing Mn2+ is 3-7，and the pH range of aqueous s
本标准规定了用苯甲酰氯衍生化-高效液相色谱-紫外检测法测定水中腐胺、尸胺、亚精胺、精胺及组胺含量的方法。 本标准适用于水中2.0 mg/L～40.0 mg/L的腐胺、尸胺、亚精胺、精胺及组胺的测定。
本标准规定了水中三嗪类除草剂莠去津、西玛津、扑草净和苯脲类除草剂绿麦隆、异丙隆等除草剂残留量的液相色谱/质谱测定方法。 本标准适用于农田灌溉用水、地表水、地下水等水中三嗪类和苯脲类除草剂残留量的测定。 本标准的检出限：扑草净为0.05 μg/L，莠去津、西玛津、绿麦隆、异丙隆为0.25 μg/L。
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