。 4.對(duì)重量制備方法以及制備后半年量值的穩(wěn)定性?xún)刹糠植淮_定度進(jìn)行總體評(píng)定,前五種標(biāo)物的相對(duì)擴(kuò)展不確定度均在2%以?xún)?nèi),達(dá)到了級(jí)標(biāo)準(zhǔn)物質(zhì)申報(bào)要求,已被質(zhì)檢總局批準(zhǔn)為二級(jí)標(biāo)準(zhǔn)物質(zhì)。

填充柱測(cè)定食品級(jí)二氧化碳 圖片：



Determination of food grade carbon dioxide by PEG-20M column
Determination of food grade carbon dioxide by PEG-20M column Detailed information:

Fixative: 10% polyethylene glycol

Support: 101 white carrier

Particle size: 0.17mm--0.25mm

Model: PEG-20M/101

application:

GB 10621-2006 food additive liquid carbon dioxide
GB 1886.228-2016 National Food Safety Standards Food Additives Carbon Dioxide





The quality of food-grade carbon dioxide is closely related to people's health, so it is especially important to strictly control the impurities in carbon dioxide products. China has introduced national standards for controlling the content of impurities in food grade carbon dioxide, but most of the national standard materials involved in the standard are blank, which leads to defects in traceability and transmission. At the same time, China's food-grade carbon dioxide sources are extensive, impurity levels and purification levels are uneven, directly affecting the quality of subsequent food. Therefore, the development of gas standard materials for trace components in food-grade carbon dioxide is of great significance for strictly controlling the quality of carbon dioxide in China's food additives and unifying national testing standards. The specific research results are as follows:1. Seven gas standard materials such as C2H5OH/CO2, C6H6/CO2, H2S/CO2, SO2/CO2, COS/CO2, O2/CO2, C2H3Cl/CO2 were prepared by gravimetric method. The adsorption of ethanol, benzene and sulfide were investigated in the preparation process. The results showed that the adsorption capacity of the cylinder was negligible with the specially treated gas cylinder and pre-saturation technology. By optimizing the gas chromatographic conditions, the best analytical methods for seven impurities were selected. The RSD was no more than 1.3%, and the linear correlation coefficient was greater than 0.9992. The standard gas was developed and compared, and the first five kinds of standards were reproducible, the quantity changed with time, and the quantity changed with pressure. The result was good. 4. The two parts of the uncertainty of the weight preparation method and the stability of the semi-annual value after preparation are evaluated. The relative expansion uncertainty of the first five standards is within 2%, which meets the national standard substance declaration requirements. It has been approved by the General Administration of Quality Supervision, Inspection and Quarantine as a national secondary standard substance.

Determination of food grade carbon dioxide by PEG-20M column