上课把女同桌内裤摸湿,一线高清视频在线观看www国产,色综合伊人色综合网站下载,男人边吃奶摸下边免费视频,精品综合久久久久久蜜月

【Scope of application】

A new formaldehyde quantitative measuring instrument developed in accordance with the national standard method. It is widely used in the rapid quantitative determination of formaldehyde in textiles.

【Related standards】

GB/T2912.1 GB18401

【Basic technical specifications】

1. The lower limit of determination: 5.00mg/kg

2. Measuring range: 0.00-500.00mg/kg (a sample diluted 10 times can reach 5000 mg/kg)

3. Measurement accuracy: ≤ 5%

4. Measurement method: Using the national standard acetylacetone method, formaldehyde reacts with acetylacetone (in the presence of acetic acid-ammonium acetate buffer solution) to produce yellow compounds. To

5. Light source: ultra-bright light-emitting diode, wavelength 412nm