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JędrzejKowalewski,AnnaWojciechowicz,MichałZięba,MikołajPodgórski,ŁukaszBuczkowski
Tetestswerecarriedoutonfivelignitesamplesofdińerentcalorificval-
ues,andvaryingsulfur,andashcontent.Teparametersvarieddepending
onwherethesamplewastakeninthefield.Teexactparametersofthesam-
pleswerepreviouslydeterminedbyelementarylaboratorymethods(Tab.1)
toestablishareferencepointforfurtherresearchusingtheLIBStechnique.
Table1.Parametersofthetestedlignitesamples(determinedusingelementarylabo-
ratorymethods)
Sample1:
Sample2:
Sample6
Sample7
Sample8
Sampleno
CalorifcvalueQ[kJ/kg]
12500
12500
13520
9400
8300
Sulfurcontent[%]
0.18
2,33
0.18
0.16
1.5
Ashcontent[%]
22.1
22.1
5.5
25
8
Inthetestedsamples(Fig.4-8)thefollowingspectrawererecorded:car-
bon,sulfur,oxygen,andnitrogen.Insamplesno.1,2,7,and8,characteris-
tic,intensepeakscorrespondingtothecarbonspectrumwererecordedat
thelengthsof588.9nm,766.4nm,and769.9nm.Teminimumshifoc-
curredinsample6where,inadditionto588.9nm,carbonisobservedat
766.8nmand770.3nm.Inaddition,thepresenceofcarbonwasrecordedin
eachsampleatwavelengthsexceeding890nm,successively893.1insample
1,892.8nminsample2,890.1nminsample6,892.0nminsample7and
894.6nminsample8.Anoxygenpeakat759.4nmwasrecordedineachsam-
ple.Inaddition,slightsulfurpeakswereobservedat602.6nmand741.7nm
insamples1and2,602.6and774.0nminsample6,603.5nminsample7,
and605.1nminsample7.sample8.Telowsulfurintensityineachofthe
browncoalsamplesmayresultfromthefactthatitscontentsarerelatively
lowinrelationtothevolumeoftheentiresample(from0.16%-2.33%).
Sampleno.1alsoshowsacharacteristicpeakforthenitrogenspectrumat
awavelengthof575.0nm.Nodistinctnitrogenspectrumwasobservedin
theremainingsamples.
Insamples1and2(Fig.4,5),thehighestintensitiesofcharacteristicele-
ments(C,S,N,O)wererecordedamongallanalyzedbrowncoals.Teywere
themostreliableofthetestedsamples,thankstowhichitwaspossibleto
determinethechemicalcomposition.Muchlowerintensitieswererecorded
insamples6and7(Fig.6,7).However,despitetherelativelylowintensities
obtainedinsamples6and7,thesevaluescorrespondedtothewavelengths
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