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      Oxalate standard night
      Red bright red labeling liquid
      CYDTA standard liquid 0.1 mol/L 50ml
      Trichlorfon labeled liquid 100ppm 1ml
      Iodine-potassium iodide standard solution
      Conductivity standard sample
      P-Dimethylaminobenzaldehyde standard solution
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      Polycyclic aromatic hydrocarbon standard
      Sodium iodide standard solution
      Mixed standard of p-cresol and methanol
      Indigo labeled solution
      Iodine ion standard solution
      Tannic acid standard solution
      Potassium iodate standard solution
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