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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
              Succinic acid standard solution
              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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