Long-term variability in sugarcane bagasse feedstock compositional methods: sources and magnitude of analytical variability

Table 1 The short-term round-robin set: descriptive statistics of NIST RM 8491 sugarcane bagasse composition on an extractives-free, % dry mass basis

	Ash	ASL	AIR	Glucan	Xylan	Galactan	Arabinan	Acetyl	Total component closure
Mean	3.71	4.18	22.16	41.13	23.19	0.76	1.84	3.34	100.71
SD	0.20	0.56	0.34	0.62	0.41	0.19	0.24	0.05	1.34
Pooled SD	0.15	0.09	0.19	0.40	0.24	0.09	0.13	0.04	0.70
N	67	66	66	58	58	55	58	67	58
RSD (%)	5.4	13.3	1.5	1.5	1.8	24.9	13.1	1.4	1.3
RpSD (%)	4.1	2.1	0.9	1.0	1.0	12.0	7.1	1.3	0.7

These samples were taken from a single large-scale extraction and analyzed in replicate (7–10 times) per batch/analyst. They were analyzed in one lab on one HPLC system using the same standards as part of an experiment to artificially reduce variability. The pooled standard deviation was calculated by batch/analyst
SD standard deviation, Pooled SD pooled standard deviation, N number of samples analyzed, RSD relative standard deviation, RpSD relative standard deviation calculated from the pooled SD, ASL acid-soluble lignin, AIR acid insoluble residue

ISSN: 2731-3654