SN/T 1115-2002Method for the determination of oxadiazon residues in fruits for import and export (English PDF)

2.1 Inspection lot

No more than 1500 pieces for an inspection lot.

Goods in the same inspection lot should have the same characteristics, such as packaging, marking, origin, specifications and grades.

2.2 Number of samples (see Table 1)

Table 1

Minimum number of samples in batch 1~25 1 26~100 5 101~250 10 251~1500 15

2.3 Sampling method

The number of samples according to 2.2 is randomly selected and opened one by one. Take at least 500g of each piece as the original sample, the total amount of the original sample shall not be Less than 2kg. After the seal, mark the mark and send it to the laboratory in time.

2.4 Sample preparation

The original sample was taken out to 1 kg, and the edible portion was taken, crushed by a tissue masher, and divided into two parts, and placed in a clean container as Sample. Seal and mark.

2.5 Sample storage

The sample was stored frozen below -18 °C.

Note. Samples must be protected from contamination or changes in residue levels during sampling and sample preparation operations.

3.1 Method summary

The oxaloxan residue in the sample is extracted with benzene-n-hexane and then purified by a small column of activated carbon, using a gas phase with a mass selective detector.

The chromatograph was measured and confirmed, and the external standard method was used for quantification.

3.2 Reagents and materials

All reagents were of analytical grade and water was distilled water unless otherwise specified.

3.2.1 Benzene. heavy distillation.

3.2.2 n-hexane. heavy distillation.