With 3 M sodium hydroxide pretreatment, the insoluble residue
fraction contained 72.9% cellulose, 9.1% hemicellulose, and 9.0% lignin per 100 g dry biomass.
The alcohol insoluble residue
(AIR) was dried in oven at 60[degrees]C for 24 h.
The influence of modification time on the concentration of insoluble residue
is presented in Tables 1 and 2.
The average mineral composition of drill core sections, each 0.5-2 m long, as well as the insoluble residue
of selected samples from different layers were studied by XRD and selectively by scanning electron microscopy integrated with energy-dispersive X-ray spectroscopy (SEM-EDS) methods.
Portland cement's insoluble residue
is due to the addition of pozzolans, also identified in the chemical composition (Table 1).
Rambo et al., (2014) have assessed the acid insoluble residue
through 13C NMR (nuclear magnetic resonance) after the acid hydrolysis of some lignocellulosic biomasses.
In the Margala Hill Limestone this type of fabric found within middle shelf facies seems to be the result of continuous dissolution of texturally homogenous limestone with appreciable quantity of uniformly distributed clay minerals or iron oxide insoluble residue
Calcium concentrations calculated based on starting shell weights averaged 56 [+ or -] 18% of concentrations expected in stoichiometric CaC[O.sub.3]; these systematically low values are consistent with samples having appreciable insoluble residue
contents (in agreement with the range of our insoluble residue
determinations described earlier).
Klason lignin was determined as the 12 M [H.sub.2]S[O.sub.4] insoluble residue
. Total DF is the sum of Klason lignin and total NSP.
It is also interesting to observe that most trace elements display positive interrelationships with the major insoluble residue
components of the rock (Table 6) and prominent among these are the Si[O.sub.2]--[Al.sub.2][O.sub.3]--[K.sub.2]O--Ti[O.sub.2] --[Fe.sub.2][O.sub.3]--Ba--Nb--Rb--Zr links (Table 6, Figure 10).