1.4 Process of sampling • Check sample→original sample→average sample • 检样：由分析对象大批物料的各个部分采集的少 量物料称为检样。 • 原始样品：许多份检样综合在一起称为原始样品。 • 平均样品：原始样品经过技术处理，再抽取其中 的一部分供分析检验的样品，称为平均样品
1.4 Process of sampling • Check sample→original sample→average sample • 检样：由分析对象大批物料的各个部分采集的少 量物料称为检样。 • 原始样品：许多份检样综合在一起称为原始样品。 • 平均样品：原始样品经过技术处理，再抽取其中 的一部分供分析检验的样品，称为平均样品
1.5 General method of sampling • 1) Random sampling • 2) Representative sampling
1.5 General method of sampling • 1) Random sampling • 2) Representative sampling
Sampling method 1) Uniform solid materials 2) Stiff semi-solid materials 3) Liquid materials 4) Solid foods of uniform composition
Sampling method 1) Uniform solid materials 2) Stiff semi-solid materials 3) Liquid materials 4) Solid foods of uniform composition
1.6 Quantity of sample • Sample should be divided into three parts , and each quantity should be no less than 0.5 kg
1.6 Quantity of sample • Sample should be divided into three parts , and each quantity should be no less than 0.5 kg
1.7 Attention on sampling • 1) Any sampling tool should be clean. • 2) Keep the original condition of microorganism and physical chemistry of sample. Avoid population or change of sample
1.7 Attention on sampling • 1) Any sampling tool should be clean. • 2) Keep the original condition of microorganism and physical chemistry of sample. Avoid population or change of sample