01852naa a2200241 a 450000100080000000500110000800800410001910000240006024500710008426000090015530000160016450000600018052010140024065300140125465300170126870000230128570000150130870000200132370000150134370000150135870000200137377302170139320034002023-05-16       2014    bl uuuu     u00u1 u    #d1 aPINARES-PATIÑO, C.  aData quality assurance and quality control.h[electronic resource]  c2014  ap. 134-144.  aDisponível em : http://www.globalresearchalliance.org.  a'Quality assurance? implies that a level of desired experimental quality is maintained throughout when estimating emissions of methane (CH4) using the SF6 tracer technique. In other words, that all actions are unbiased, and that the animals respond in a ?normal? manner to the experimental conditions. ?Quality control? involves steps and protocols, closely followed, to ensure that experimental results are valid, thereby assuring data quality. This chapter highlights some issues encountered when using the SF6 tracer technique for estimating CH4 emissions from ruminants, both indoors and under free-ranging situations. It briefly addresses problems associated with permeation tube calibration and expected in situ release of the SF6 (see Chapter 4 for more details), efficiency of sample collection and anomalies of unknown origin. It also suggests steps for data screening for outliers. Here, we refrain from addressing issues related to sample analysis for concentrations of CH4 and SF6 (see Chapter 8).  aAssurance  aData quality1 aWILLIAMS, S. R. O.1 aMARTIN, C.1 aSWAINSON, N. M.1 aBERNDT, A.1 aMOLANO, G.1 aKOOLAARD, J. P.  tIn: LAMBERT, M. G. Guidelines for use of surphur hexafluoride (SF6) tracer technique to measure enteric methane emissions from ruminants. Wellington: New Zealand Agricultural Greenhouse Gas Research Center, 2014.