请问各位大神,纺织品甲醛测试时,用哪个作为空白?我看了下:GB/T 2912.1-2009上是用5mL水+5mL乙酰丙酮作为对照空白;但是ISO 14184-1:2011上又没有说明白。8.2 Keep the test tubes first in a water bath at (40 ±2) °C for (30 ±5) min and then at ambient temperature for (30 ±5) min. Take the solution of 5 ml of acetylacetone reagent solution in 5 ml of water having been treated in the same way as the blank reagent. Using a spectrophotometer (5.5), measure the absorbances in a 10 mm absorption cell at a wavelength of 412 nm against water (4.1). 这是ISO方法上的,黑体字部分前后感觉是矛盾的,前面写5mL水+5mL乙酰丙酮作为试剂空白,后面做曲线和测试样品的时候又用水作为参比。不知道各位大神是怎么理解的?国标是参照ISO标准写的,怎么感觉没有全部照搬呢?另外如果按国标做,那做曲线的时候要不要扣除空白值?还是将空白作为曲线上的一个点?