Chemical composition of traditionally and lesser used wood species from Mozambique

Lhate, Inácio; Cuvilas, Carlos Alberto; Terzıev, Nasko; Jirjis, Raída

doi:10.1080/17480272.2010.484867

Cited by 17 publications

(13 citation statements)

References 18 publications

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“…For example Afzelia africana with an oxygen concentration of 40.585% had an experimental gross heat value (GHVe) of 21,350.35 kJ/kg followed by Nauclea diderrichii with an oxygen concentration of 40.608% and a GHVe of 21157.30 kJ/kg. This is in line with the observation that the concentration of oxygen that negatively affected the higher heating value (HHV) was in the range of 40.60%wt -45.2wt% (db) for all species [16].…”

Section: Gross Heat Values/oxygen Concentrationsupporting

confidence: 91%

An Evaluation of the Calorific Values of the Branches and Stems of 11 Tropical Trees

Duruaku¹,

Ajiwe²,

Okoye³

et al. 2016

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This work investigated and quantified the calorific values of the main branches and trunks of eleven (11) tropical trees in correlation with their chemical composition in order to assess their suitability for use as credible sources of wood fuel. The determination of the carbon, hydrogen, nitrogen, oxygen and sulphur (CHNOS) content of the samples was done using an organic elemental analyser, while an oxygen bomb calorimeter was used to experimentally determine their corresponding gross heat values. The experimental gross heat values for the branches examined ranged from 18,703.37 kJ/kg in Lophira lanceolata to 21,350.35 kJ/kg in Afzelia africana while that of the trunks ranged from 19,747.74 kJ/kg in Tectonia grandis to 22,408.68 kJ/kg in Prosopis africana. These values were within and about the expected ranges observed for tropical trees and may be considered adequate for wood fuel. The general trend in both branches and trunks was that the higher the carbon content, the higher the gross heat value of sample. The absence of sulphur in almost all the samples except, Prosopis africana, (0.055%) was indicative of the fact that the negative environmental impact with respect to harmful emissions of oxides of sulphur is practically non-existent with respect to these species. In the light of the aforementioned variables, the main branches of Afzelia africana (21,350.35 kJ/kg), Nauclea diderrichii (21,157.30 kJ/kg) and Tectonia grandis (20,257.13 kJ/kg) could be used as credible sources of firewood and charcoal production. With respect to the trunks, the timbers in order of preference would ideally be Prosopis africana (22,408.68 kJ/kg), Nauclea diderichii (21,436.42 kJ/kg) and Brachstigia eurychoma (20,924.7 kJ/kg).

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Section: Gross Heat Values/oxygen Concentrationsupporting

confidence: 91%

An Evaluation of the Calorific Values of the Branches and Stems of 11 Tropical Trees

Duruaku¹,

Ajiwe²,

Okoye³

et al. 2016

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“…Bamboo lignin is typical of monocotyledon lignin showing in its UV spectrum a guaiacyl peak at 280 nm and a shoulder between 310 and 320 nm (Koch and Kleist 2001;Schmidt et al 2013). Based on average lignin content, the studied bamboo is comparable to some tropical hardwood species, such as icuria and metil (Lhate et al 2010) with average lignin content below 27%. It can be concluded that the chemical compositions of the bamboos originating from the four studied sites were very similar.…”

Section: Chemical Analysesmentioning

confidence: 99%

Bamboo (Bambusa vulgaris Schrad.) from Moist Forest and Derived Savanna Locations in South West Nigeria – Properties and Gluability

Ogunsanwo¹,

Terzıev²,

Panov³

et al. 2015

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Bamboo culms of Bambusa vulgaris Schrad. were collected from two locations in moist forests and two sites in derived Savanna zones in South West Nigeria. The study involved chemical analyses, density variability, bonding tests, gluability tests, and measurements of bending strength of the bamboo in addition to durability testing with decay fungi and treatability of glued boards with a copper-based wood preservative. Chemical analyses showed a uniform composition of the bamboo with a cellulose content of 45 to 47.5% and a lignin content of 23 to 25.6% as the predominant chemical constituents. An average wood density of 700 kg/m 3 was a prerequisite for high mechanical strength. The moduli of elasticity were high and exceeded 14 kN/mm 2 for bamboo boards and 13 kN/mm 2 for finger joints. Bamboo boards from all growth sites showed high moduli of rupture in the range of 150 to 166 N/mm 2 and 72.9 to 94.7 N/mm 2 for boards and finger joints, respectively. Bamboo from the four sites showed variable mass loss with the EN-113 (1996) test method, which classifies this biomass as a moderately to non-durable plant material. White rot fungus (Trametes versicolor) caused the highest mass losses (11.2 to 16.8%). The bamboo showed good treatability using a 500-kg/m 3 solution of a copper-based preservative.

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“…Additionally, Lima et al (2007) found that the extractives could cause alteration of the wood colouration. Uetimane et al (2018) determined a total extractive content of 18,5 % for one of the most common commercial tropical species of Mozambique (jambire), while Lhate et al (2010) reported average values of 9,92 and 11,69 % for the other two commercial species (chanfuta and umbila, respectively). Bila et al (2016) quantified the total extractive content of six tropical wood species from the Amazon rainforest and found average values ranging from 3,19 % to 11,67 %.…”

Section: Wood Density and Chemical Analysesmentioning

confidence: 99%

Bonding quality of two lesser-used wood species Brachystegia spiciformis and Julbernardia globiflora from Mozambique

Bila

Trianoski

Iwakiri

et al. 2021

Maderas, Cienc. tecnol.

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The objective of this study was to evaluate the density, chemical properties and bonding quality of two lesser-used Mozambican wood species known as messassas (Brachystegia spiciformis and Julbernardia globiflora) aiming at edge-glued panel production. The bonding was performed using structural adhesive polyvinyl acetate D4, semi-structural adhesive emulsion polymer isocyanate and non-structural polyvinyl acetate D3 applied at 120•m -2 and 180•m -2 weights. Density, chemistry, edge shear bonding, wood failure percentage and the finger-joint tests were performed in accordance with standards. The results showed that both species have medium density, high extractives and lignin contents typical of tropical wood. The emulsion polymer isocyanate adhesive was approved with better performance compared to polyvinyl acetate D3 and D4 adhesives. It can also be affirmed that Brachystegia spiciformis and Julbernardia globiflora have similar bonding behaviour and the potential for producing edge glued panel panels, especially for indoor use.

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Chemical composition of traditionally and lesser used wood species from Mozambique

Cited by 17 publications

References 18 publications

An Evaluation of the Calorific Values of the Branches and Stems of 11 Tropical Trees

An Evaluation of the Calorific Values of the Branches and Stems of 11 Tropical Trees

Bamboo (Bambusa vulgaris Schrad.) from Moist Forest and Derived Savanna Locations in South West Nigeria – Properties and Gluability

Bonding quality of two lesser-used wood species Brachystegia spiciformis and Julbernardia globiflora from Mozambique

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