เคมี
เอกสารมาตรฐาน
สหรัฐอเมริกา
AOCS
Ba 4c-87
SURPLUS Modified Kjeldahl Method (Kjel-Foss Automatic)
1989
2
665.0288 AOCS 4th ed. Ref.
This method determines, as ammonia, the total nitrogen content of the sample. Automation of the macro Kjeldahl method is in six steps: sample and reagent addition, initial and final digestion, cooling and dilution, sodium hydroxide addition, steam distillation and titration, and automatic pumping of flask contents to contained waste. Chemistry is carried out in macro Kjeldahl flasks equipped with side arms which are rotated at three minute intervals through each successive step. Applicable to soybean meal.