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应用同位素和元素分析鉴别稻米的原产地
2011-03-31 11:08
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Rice samples cultivated in the USA, Europe and Basmati regions have been
analysed using Isotope Ratio Mass Spectrometry (IRMS) and Inductively
Coupled Plasma Mass Spectrometry (ICP-MS). Nine key variables (δ13C,
δ18O, boron, holmium, gadolinium, magnesium, rubidium, selenium and
tungsten) were identified by canonical discriminant analysis as providing
the maximum discrimination between rice samples from these regions.
High levels of boron (>2500 ppb) were associated with rice samples from
America and notably high levels of holmium were found in rice samples
from the state of Arkansas. European rice samples generally contained
relatively high levels of magnesium and Indian/Pakistani samples were
characterised by relatively low oxygen-18 ( 18O) abundance.
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GB/T 18932的本部分规定了蜂蜜中碳-4植物糖含量的稳定碳同位素比率测定方法。本部分适用于各种蜂蜜中碳-4植物（玉米或甘蔗）糖含量的测定。
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